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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<div class='path'>path: <a href='/guix/log/?id=c9e1fff79310f876821ed1ff5354bd79a08ed5cc'>root</a>/<a href='/guix/log/gnu?id=c9e1fff79310f876821ed1ff5354bd79a08ed5cc'>gnu</a>/<a href='/guix/log/gnu/services?id=c9e1fff79310f876821ed1ff5354bd79a08ed5cc'>services</a>/<a href='/guix/log/gnu/services/mcron.scm?id=c9e1fff79310f876821ed1ff5354bd79a08ed5cc'>mcron.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/mcron.scm?id=c9e1fff79310f876821ed1ff5354bd79a08ed5cc&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-03-21 14:51:24 -0400'>2023-03-21</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=c88582a6740777b5f15690990b04cdd153905042'>services: mcron: Add log-file and date-format fields.</a><span class='msg-avail'>...</span></td><td>Bruno Victal</td></tr>
<tr><td><span title='2023-03-21 14:31:22 -0400'>2023-03-21</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=edb398449f72d95334f78661b74fb9d0c9148eab'>services: mcron: Use match-record.</a><span class='msg-avail'>...</span></td><td>Bruno Victal</td></tr>
<tr><td><span title='2023-03-21 14:31:22 -0400'>2023-03-21</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=6f4fd8f5b87d9f55013c91ecc3b92fc43269599e'>services: mcron: Restyle mcron-configuration.</a><span class='msg-avail'>...</span></td><td>Bruno Victal</td></tr>
<tr><td><span title='2022-11-17 06:49:51 -0500'>2022-11-17</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=44554e7133aa60e1b453436be1e80394189cabd9'>Revert "services: configuration: Revert to a working ‘guix home’."</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-11-13 01:00:00 +0100'>2022-11-13</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=39e4e00f75be8055300cb0afffb8bd4b4d35f2cc'>services: configuration: Revert to a working ‘guix home’.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-11-15 16:26:16 -0500'>2022-11-15</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=9b21cd2e9a614f1937769caf3917a791b151d841'>services: mcron: Add log? and log-format fields to mcron-configuration.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>