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='2023-07-23 22:26:01 -0400'>2023-07-23</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/6.6-arm.conf?id=b817d261e2f9addba594583e154e4d9b6a850928'>gnu: Add linux-libre 6.6.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/linux.scm (linux-libre-6.6-version, linux-libre-6.6-gnu-revision,
deblob-scripts-6.6, linux-libre-6.6-pristine-source, linux-libre-6.5-source,
linux-libre-headers-6.6, linux-libre-6.6): New variables.
* gnu/packages/aux-files/linux-libre/6.6-arm.conf,
gnu/packages/aux-files/linux-libre/6.6-arm64.conf,
gnu/packages/aux-files/linux-libre/6.6-i686.conf,
gnu/packages/aux-files/linux-libre/6.6-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Add them.

Change-Id: I37b2b98b8a2ec745137e92380f34e69082c5e662
Signed-off-by: Leo Famulari &lt;leo@famulari.name&gt;
</span></span></td><td>Wilko Meyer</td></tr>