The VTK_MAJOR_VERSION macro is not available by default in newer versions.
This is a hack to expose it without changing all imports.

diff --git a/addons/vtk/CMakeLists.txt b/addons/vtk/CMakeLists.txt
--- a/addons/vtk/CMakeLists.txt
+++ b/addons/vtk/CMakeLists.txt
@@ -36,6 +36,8 @@ IF(WITH_VTKIO)
     ELSE()
       SET(SELECTED_VTK_LIBS ${VTK_MODULES_REQUESTED})
     ENDIF()
+
+   add_compile_definitions(VTK_MAJOR_VERSION=${VTK_VERSION_MAJOR})
     
     SET(VTK_LINK_LIBS_MESH ${SELECTED_VTK_LIBS} miamesh)
     SET(VTK_LINK_LIBS_3D ${SELECTED_VTK_LIBS} mia3d)
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<tr><td><span title='2021-04-12 18:42:22 +0200'>2021-04-12</span></td><td><a href='/guix/commit/tests/ipfs.scm?id=b18f45c21f5d697d384a7bd5c9d3ee314bba9e35'>Add (guix ipfs).</a><span class='msg-avail'>...<span class='msg-tooltip'>This module allows for communicating with the IPFS
gateway over the HTTP interface.  The commit has been
cherry-picked from &lt;https://issues.guix.gnu.org/33899&gt;.

The procedures for adding and restoring file trees have
been removed as according to a reply issue 33899, a different
format will be used.  The procedure 'add-data' has been
exported as it will be used in the system test for IPFS.

* guix/ipfs.scm: New file.
* Makefile.am (MODULES): Add it.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Ludovic Courtès</td></tr>