diff --git a/.github/workflows/build-xtgeo.yml b/.github/workflows/build-xtgeo.yml
index fd1df4aaadb2..c2930f1ecf93 100644
--- a/.github/workflows/build-xtgeo.yml
+++ b/.github/workflows/build-xtgeo.yml
@@ -97,6 +97,9 @@ jobs:
             PIP_ONLY_BINARY=numpy,pandas,scipy,pyarrow,h5py,hdf5plugin,matplotlib,segyio,shapely,pillow
             SETUPTOOLS_SCM_PRETEND_VERSION_FOR_XTGEO=${{ env.XTGEO_VERSION }}
           CIBW_TEST_EXTRAS: dev
+          # pytest-benchmark's fixture reads Function._nodeid, which pytest 9.2 removed, so
+          # every benchmark test errors at setup; stay on the pytest 9.1 series.
+          CIBW_TEST_REQUIRES: pytest<9.2
           CIBW_BEFORE_TEST: >-
             pushd {package} &&
             git clone --depth 1 https://github.com/equinor/xtgeo-testdata ../xtgeo-testdata || true
diff --git a/docs/packages/xtgeo.yaml b/docs/packages/xtgeo.yaml
index 97d823efbddb..0baeb8ef9298 100644
--- a/docs/packages/xtgeo.yaml
+++ b/docs/packages/xtgeo.yaml
@@ -15,3 +15,5 @@ versions:
   - filename: xtgeo-4.25.1-cp314-cp314-manylinux_2_39_riscv64.whl
     sha256: 703bc84302d2072954bafa7408df138b32db75cbaf4e15ce454f66fdbf191b10
     requires-python: '>=3.11'
+- version: 4.26.0
+- version: 4.27.0
diff --git a/patches/xtgeo/4.26.0/0001-unpin-swig-for-riscv64.patch b/patches/xtgeo/4.26.0/0001-unpin-swig-for-riscv64.patch
new file mode 100644
index 000000000000..0709ec188a17
--- /dev/null
+++ b/patches/xtgeo/4.26.0/0001-unpin-swig-for-riscv64.patch
@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 13 Oct 2026 07:54:08 +0000
+Subject: [PATCH] unpin swig for riscv64
+
+pyproject.toml's build-system.requires pins "swig<4.3.0". PyPI's swig
+package only started publishing manylinux_riscv64 wheels at 4.3.1.post0,
+so pip falls back to building swig itself from its sdist on riscv64 for
+no reason that applies to this build: the pin (commit 839503b) exists to
+avoid a SWIG 4.3.0 numpy.i regression that segfaulted under Python 3.8 +
+pandas>2, and this release already requires Python >=3.11.
+
+Drop the pin so pip resolves swig 4.5.1, which ships a riscv64 wheel.
+
+Upstream-Status: Inappropriate [riscv64-only infra constraint; the pin's own Python 3.8 rationale no longer applies to this release]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ pyproject.toml | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pyproject.toml b/pyproject.toml
+index 718ff67..5b6f1cc 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -3,7 +3,7 @@ requires = [
+     "numpy>=2.0.0",
+     "pybind11",
+     "scikit-build-core[pyproject]>=0.10",
+-    "swig<4.3.0",
++    "swig",
+ ]
+ build-backend = "scikit_build_core.build"
+
diff --git a/patches/xtgeo/4.26.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch b/patches/xtgeo/4.26.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch
new file mode 100644
index 000000000000..ee2c36a27240
--- /dev/null
+++ b/patches/xtgeo/4.26.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch
@@ -0,0 +1,379 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 13 Oct 2026 08:08:08 +0000
+Subject: [PATCH] fix numpy.i for SWIG >=4.3's 3-arg SWIG_Python_AppendOutput
+
+SWIG 4.3.0 added an `is_void` third parameter to its generated
+SWIG_Python_AppendOutput() runtime helper (pyrun.swg). xtgeo's own
+project-local src/lib/numpy.i still calls it with the pre-4.3 two-arg
+form in every ARGOUT_ARRAY* typemap, so building with any SWIG >=4.3
+fails with "too few arguments to function 'SWIG_Python_AppendOutput'"
+-- reproduces on any arch, this host included.
+
+Call SWIG's SWIG_AppendOutput() macro instead, as numpy's own current
+tools/swig/numpy.i does. SWIG >=4.3 defines it as
+SWIG_Python_AppendOutput(result, obj, $isvoid) and older SWIG as the
+two-arg call, so it builds with any version. $isvoid matters: the
+helper only replaces a Py_None result when is_void is set, and a void
+C function's result starts as Py_None, so a hardcoded 0 would make
+every void function with ARGOUT arrays (grdcp3d_get_vtk_grid_arrays)
+return [None, a, b, c] instead of the pre-4.3 [a, b, c].
+
+This is required independently of which SWIG >=4.3 is used: swig<4.3
+has no riscv64 wheel on PyPI (gotcha territory -- see the companion
+0001 patch, which drops that pin), and 4.3.1.post0 (the first riscv64
+release) hits this same error.
+
+Upstream-Status: Inappropriate [riscv64 needs SWIG>=4.3.1.post0 for a PyPI wheel; this project-local numpy.i was never updated for SWIG 4.3's runtime signature change]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ src/lib/numpy.i | 76 ++++++++++++++++++++++++-------------------------
+ 1 file changed, 38 insertions(+), 38 deletions(-)
+
+diff --git a/src/lib/numpy.i b/src/lib/numpy.i
+index b8fdaeb..60eb016 100644
+--- a/src/lib/numpy.i
++++ b/src/lib/numpy.i
+@@ -1988,7 +1988,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY1[ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE* ARGOUT_ARRAY1, DIM_TYPE DIM1)
+@@ -2016,7 +2016,7 @@
+ %typemap(argout)
+   (DATA_TYPE* ARGOUT_ARRAY1, DIM_TYPE DIM1)
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE DIM1, DATA_TYPE* ARGOUT_ARRAY1)
+@@ -2044,7 +2044,7 @@
+ %typemap(argout)
+   (DIM_TYPE DIM1, DATA_TYPE* ARGOUT_ARRAY1)
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY2[ANY][ANY])
+@@ -2062,7 +2062,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY2[ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY3[ANY][ANY][ANY])
+@@ -2080,7 +2080,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY3[ANY][ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY4[ANY][ANY][ANY][ANY])
+@@ -2098,7 +2098,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY4[ANY][ANY][ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /*****************************/
+@@ -2123,7 +2123,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DATA_TYPE** ARGOUTVIEW_ARRAY1)
+@@ -2144,7 +2144,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2166,7 +2166,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEW_ARRAY2)
+@@ -2188,7 +2188,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2210,7 +2210,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEW_FARRAY2)
+@@ -2232,7 +2232,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2256,7 +2256,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2280,7 +2280,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2304,7 +2304,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2328,7 +2328,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2353,7 +2353,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2378,7 +2378,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2403,7 +2403,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2428,7 +2428,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /*************************************/
+@@ -2466,7 +2466,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DATA_TYPE** ARGOUTVIEWM_ARRAY1)
+@@ -2500,7 +2500,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2535,7 +2535,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEWM_ARRAY2)
+@@ -2570,7 +2570,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2605,7 +2605,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEWM_FARRAY2)
+@@ -2640,7 +2640,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2677,7 +2677,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2714,7 +2714,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2751,7 +2751,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2788,7 +2788,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2826,7 +2826,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2864,7 +2864,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2902,7 +2902,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2940,7 +2940,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2978,7 +2978,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -3016,7 +3016,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -3054,7 +3054,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -3092,7 +3092,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /**************************************/
diff --git a/patches/xtgeo/4.26.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch b/patches/xtgeo/4.26.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch
new file mode 100644
index 000000000000..e8a8cbcddff5
--- /dev/null
+++ b/patches/xtgeo/4.26.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch
@@ -0,0 +1,78 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Fri, 23 Oct 2026 16:30:00 +0000
+Subject: [PATCH] fix numpy.i for SWIG >=4.5's removed Python 2 macros
+
+SWIG 4.5.0 dropped the Python 2 compatibility macros from its
+pyhead.swg runtime, including PyString_Check, PyInt_Check and
+PyInt_AsLong. xtgeo's project-local src/lib/numpy.i still uses those
+three, so with SWIG >=4.5 the generated cxtgeoPYTHON_wrap.c calls
+undeclared functions: GCC 13 only warns, and the extension then fails
+to import with "undefined symbol: PyInt_AsLong"; GCC 14 rejects the
+implicit declarations outright. Reproduces on any arch.
+
+Replace each with the exact expansion SWIG <=4.4's pyhead.swg used on
+Python 3 (PyBytes_Check, PyLong_Check, PyLong_AsLong), so the generated
+code is unchanged for every SWIG version.
+
+Needed because 0001 drops the swig<4.3.0 pin, and pip then resolves
+the newest swig (4.5.1), which is the release with a riscv64 wheel.
+
+Upstream-Status: Inappropriate [only reachable once the swig<4.3.0 pin is dropped for riscv64; upstream's pinned SWIG still defines these macros]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ src/lib/numpy.i | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/src/lib/numpy.i b/src/lib/numpy.i
+index 60eb016..ff3db39 100644
+--- a/src/lib/numpy.i
++++ b/src/lib/numpy.i
+@@ -112,8 +112,8 @@
+     if (py_obj == NULL          ) return "C NULL value";
+     if (py_obj == Py_None       ) return "Python None" ;
+     if (PyCallable_Check(py_obj)) return "callable"    ;
+-    if (PyString_Check(  py_obj)) return "string"      ;
+-    if (PyInt_Check(     py_obj)) return "int"         ;
++    if (PyBytes_Check(   py_obj)) return "string"      ;
++    if (PyLong_Check(    py_obj)) return "int"         ;
+     if (PyFloat_Check(   py_obj)) return "float"       ;
+     if (PyDict_Check(    py_obj)) return "dict"        ;
+     if (PyList_Check(    py_obj)) return "list"        ;
+@@ -1999,7 +1999,7 @@
+   (PyObject* array = NULL)
+ {
+   npy_intp dims[1];
+-  if (!PyInt_Check($input))
++  if (!PyLong_Check($input))
+   {
+     const char* typestring = pytype_string($input);
+     PyErr_Format(PyExc_TypeError,
+@@ -2007,7 +2007,7 @@
+                  typestring);
+     SWIG_fail;
+   }
+-  $2 = (DIM_TYPE) PyInt_AsLong($input);
++  $2 = (DIM_TYPE) PyLong_AsLong($input);
+   dims[0] = (npy_intp) $2;
+   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
+   if (!array) SWIG_fail;
+@@ -2027,7 +2027,7 @@
+   (PyObject* array = NULL)
+ {
+   npy_intp dims[1];
+-  if (!PyInt_Check($input))
++  if (!PyLong_Check($input))
+   {
+     const char* typestring = pytype_string($input);
+     PyErr_Format(PyExc_TypeError,
+@@ -2035,7 +2035,7 @@
+                  typestring);
+     SWIG_fail;
+   }
+-  $1 = (DIM_TYPE) PyInt_AsLong($input);
++  $1 = (DIM_TYPE) PyLong_AsLong($input);
+   dims[0] = (npy_intp) $1;
+   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
+   if (!array) SWIG_fail;
diff --git a/patches/xtgeo/4.27.0/0001-unpin-swig-for-riscv64.patch b/patches/xtgeo/4.27.0/0001-unpin-swig-for-riscv64.patch
new file mode 100644
index 000000000000..0709ec188a17
--- /dev/null
+++ b/patches/xtgeo/4.27.0/0001-unpin-swig-for-riscv64.patch
@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 13 Oct 2026 07:54:08 +0000
+Subject: [PATCH] unpin swig for riscv64
+
+pyproject.toml's build-system.requires pins "swig<4.3.0". PyPI's swig
+package only started publishing manylinux_riscv64 wheels at 4.3.1.post0,
+so pip falls back to building swig itself from its sdist on riscv64 for
+no reason that applies to this build: the pin (commit 839503b) exists to
+avoid a SWIG 4.3.0 numpy.i regression that segfaulted under Python 3.8 +
+pandas>2, and this release already requires Python >=3.11.
+
+Drop the pin so pip resolves swig 4.5.1, which ships a riscv64 wheel.
+
+Upstream-Status: Inappropriate [riscv64-only infra constraint; the pin's own Python 3.8 rationale no longer applies to this release]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ pyproject.toml | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pyproject.toml b/pyproject.toml
+index 718ff67..5b6f1cc 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -3,7 +3,7 @@ requires = [
+     "numpy>=2.0.0",
+     "pybind11",
+     "scikit-build-core[pyproject]>=0.10",
+-    "swig<4.3.0",
++    "swig",
+ ]
+ build-backend = "scikit_build_core.build"
+
diff --git a/patches/xtgeo/4.27.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch b/patches/xtgeo/4.27.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch
new file mode 100644
index 000000000000..ee2c36a27240
--- /dev/null
+++ b/patches/xtgeo/4.27.0/0002-fix-numpy-i-for-swig-4.3-appendoutput-signature.patch
@@ -0,0 +1,379 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 13 Oct 2026 08:08:08 +0000
+Subject: [PATCH] fix numpy.i for SWIG >=4.3's 3-arg SWIG_Python_AppendOutput
+
+SWIG 4.3.0 added an `is_void` third parameter to its generated
+SWIG_Python_AppendOutput() runtime helper (pyrun.swg). xtgeo's own
+project-local src/lib/numpy.i still calls it with the pre-4.3 two-arg
+form in every ARGOUT_ARRAY* typemap, so building with any SWIG >=4.3
+fails with "too few arguments to function 'SWIG_Python_AppendOutput'"
+-- reproduces on any arch, this host included.
+
+Call SWIG's SWIG_AppendOutput() macro instead, as numpy's own current
+tools/swig/numpy.i does. SWIG >=4.3 defines it as
+SWIG_Python_AppendOutput(result, obj, $isvoid) and older SWIG as the
+two-arg call, so it builds with any version. $isvoid matters: the
+helper only replaces a Py_None result when is_void is set, and a void
+C function's result starts as Py_None, so a hardcoded 0 would make
+every void function with ARGOUT arrays (grdcp3d_get_vtk_grid_arrays)
+return [None, a, b, c] instead of the pre-4.3 [a, b, c].
+
+This is required independently of which SWIG >=4.3 is used: swig<4.3
+has no riscv64 wheel on PyPI (gotcha territory -- see the companion
+0001 patch, which drops that pin), and 4.3.1.post0 (the first riscv64
+release) hits this same error.
+
+Upstream-Status: Inappropriate [riscv64 needs SWIG>=4.3.1.post0 for a PyPI wheel; this project-local numpy.i was never updated for SWIG 4.3's runtime signature change]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ src/lib/numpy.i | 76 ++++++++++++++++++++++++-------------------------
+ 1 file changed, 38 insertions(+), 38 deletions(-)
+
+diff --git a/src/lib/numpy.i b/src/lib/numpy.i
+index b8fdaeb..60eb016 100644
+--- a/src/lib/numpy.i
++++ b/src/lib/numpy.i
+@@ -1988,7 +1988,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY1[ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE* ARGOUT_ARRAY1, DIM_TYPE DIM1)
+@@ -2016,7 +2016,7 @@
+ %typemap(argout)
+   (DATA_TYPE* ARGOUT_ARRAY1, DIM_TYPE DIM1)
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE DIM1, DATA_TYPE* ARGOUT_ARRAY1)
+@@ -2044,7 +2044,7 @@
+ %typemap(argout)
+   (DIM_TYPE DIM1, DATA_TYPE* ARGOUT_ARRAY1)
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY2[ANY][ANY])
+@@ -2062,7 +2062,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY2[ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY3[ANY][ANY][ANY])
+@@ -2080,7 +2080,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY3[ANY][ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE ARGOUT_ARRAY4[ANY][ANY][ANY][ANY])
+@@ -2098,7 +2098,7 @@
+ %typemap(argout)
+   (DATA_TYPE ARGOUT_ARRAY4[ANY][ANY][ANY][ANY])
+ {
+-  $result = SWIG_Python_AppendOutput($result,(PyObject*)array$argnum);
++  $result = SWIG_AppendOutput($result,(PyObject*)array$argnum);
+ }
+ 
+ /*****************************/
+@@ -2123,7 +2123,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DATA_TYPE** ARGOUTVIEW_ARRAY1)
+@@ -2144,7 +2144,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2166,7 +2166,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEW_ARRAY2)
+@@ -2188,7 +2188,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2210,7 +2210,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEW_FARRAY2)
+@@ -2232,7 +2232,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2256,7 +2256,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2280,7 +2280,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2304,7 +2304,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2328,7 +2328,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2353,7 +2353,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2378,7 +2378,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEW_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2403,7 +2403,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2428,7 +2428,7 @@
+   PyArrayObject* array = (PyArrayObject*) obj;
+ 
+   if (!array || !require_fortran(array)) SWIG_fail;
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /*************************************/
+@@ -2466,7 +2466,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DATA_TYPE** ARGOUTVIEWM_ARRAY1)
+@@ -2500,7 +2500,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2535,7 +2535,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEWM_ARRAY2)
+@@ -2570,7 +2570,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY2, DIM_TYPE* DIM1, DIM_TYPE* DIM2)
+@@ -2605,7 +2605,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DATA_TYPE** ARGOUTVIEWM_FARRAY2)
+@@ -2640,7 +2640,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2677,7 +2677,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2714,7 +2714,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY3, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2751,7 +2751,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3,
+@@ -2788,7 +2788,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2826,7 +2826,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2864,7 +2864,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2902,7 +2902,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -2940,7 +2940,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_ARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -2978,7 +2978,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -3016,7 +3016,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DATA_TYPE** ARGOUTVIEWM_FARRAY4, DIM_TYPE* DIM1, DIM_TYPE* DIM2,
+@@ -3054,7 +3054,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /* Typemap suite for (DIM_TYPE* DIM1, DIM_TYPE* DIM2, DIM_TYPE* DIM3, DIM_TYPE* DIM4,
+@@ -3092,7 +3092,7 @@
+   PyArray_SetBaseObject(array,cap);
+ %#endif
+ 
+-  $result = SWIG_Python_AppendOutput($result,obj);
++  $result = SWIG_AppendOutput($result,obj);
+ }
+ 
+ /**************************************/
diff --git a/patches/xtgeo/4.27.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch b/patches/xtgeo/4.27.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch
new file mode 100644
index 000000000000..e8a8cbcddff5
--- /dev/null
+++ b/patches/xtgeo/4.27.0/0003-fix-numpy-i-for-swig-4.5-removed-python2-macros.patch
@@ -0,0 +1,78 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Fri, 23 Oct 2026 16:30:00 +0000
+Subject: [PATCH] fix numpy.i for SWIG >=4.5's removed Python 2 macros
+
+SWIG 4.5.0 dropped the Python 2 compatibility macros from its
+pyhead.swg runtime, including PyString_Check, PyInt_Check and
+PyInt_AsLong. xtgeo's project-local src/lib/numpy.i still uses those
+three, so with SWIG >=4.5 the generated cxtgeoPYTHON_wrap.c calls
+undeclared functions: GCC 13 only warns, and the extension then fails
+to import with "undefined symbol: PyInt_AsLong"; GCC 14 rejects the
+implicit declarations outright. Reproduces on any arch.
+
+Replace each with the exact expansion SWIG <=4.4's pyhead.swg used on
+Python 3 (PyBytes_Check, PyLong_Check, PyLong_AsLong), so the generated
+code is unchanged for every SWIG version.
+
+Needed because 0001 drops the swig<4.3.0 pin, and pip then resolves
+the newest swig (4.5.1), which is the release with a riscv64 wheel.
+
+Upstream-Status: Inappropriate [only reachable once the swig<4.3.0 pin is dropped for riscv64; upstream's pinned SWIG still defines these macros]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ src/lib/numpy.i | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/src/lib/numpy.i b/src/lib/numpy.i
+index 60eb016..ff3db39 100644
+--- a/src/lib/numpy.i
++++ b/src/lib/numpy.i
+@@ -112,8 +112,8 @@
+     if (py_obj == NULL          ) return "C NULL value";
+     if (py_obj == Py_None       ) return "Python None" ;
+     if (PyCallable_Check(py_obj)) return "callable"    ;
+-    if (PyString_Check(  py_obj)) return "string"      ;
+-    if (PyInt_Check(     py_obj)) return "int"         ;
++    if (PyBytes_Check(   py_obj)) return "string"      ;
++    if (PyLong_Check(    py_obj)) return "int"         ;
+     if (PyFloat_Check(   py_obj)) return "float"       ;
+     if (PyDict_Check(    py_obj)) return "dict"        ;
+     if (PyList_Check(    py_obj)) return "list"        ;
+@@ -1999,7 +1999,7 @@
+   (PyObject* array = NULL)
+ {
+   npy_intp dims[1];
+-  if (!PyInt_Check($input))
++  if (!PyLong_Check($input))
+   {
+     const char* typestring = pytype_string($input);
+     PyErr_Format(PyExc_TypeError,
+@@ -2007,7 +2007,7 @@
+                  typestring);
+     SWIG_fail;
+   }
+-  $2 = (DIM_TYPE) PyInt_AsLong($input);
++  $2 = (DIM_TYPE) PyLong_AsLong($input);
+   dims[0] = (npy_intp) $2;
+   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
+   if (!array) SWIG_fail;
+@@ -2027,7 +2027,7 @@
+   (PyObject* array = NULL)
+ {
+   npy_intp dims[1];
+-  if (!PyInt_Check($input))
++  if (!PyLong_Check($input))
+   {
+     const char* typestring = pytype_string($input);
+     PyErr_Format(PyExc_TypeError,
+@@ -2035,7 +2035,7 @@
+                  typestring);
+     SWIG_fail;
+   }
+-  $1 = (DIM_TYPE) PyInt_AsLong($input);
++  $1 = (DIM_TYPE) PyLong_AsLong($input);
+   dims[0] = (npy_intp) $1;
+   array = PyArray_SimpleNew(1, dims, DATA_TYPECODE);
+   if (!array) SWIG_fail;