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='2023-12-20 01:00:45 +0100'>2023-12-20</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=dc2b59ddc1e8f510935777db40e881896f7a0cab'>gnu: axoloti-patcher: Remove trailing #T.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-patcher)[arguments]: Remove trailing #T
from build phase.

Change-Id: I1a741e41e7ae167cd72542c3f9cf9a13046bcd3c
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2023-12-20 01:00:45 +0100'>2023-12-20</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=1adf1e36d27388df04d6873c3f58d7851a9a04b9'>gnu: axoloti-patcher: Fix include paths.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-patcher)[arguments]: Add missing "c++"
sub-directory to search paths.

Change-Id: Ia3297cb24e02f92ad7af40881b9021af25093e67
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2023-09-25 10:33:04 -0400'>2023-09-25</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=35c1df5bd6317b1cd038c1a4aca1c7e4a52d4d93'>gnu: embedded: Turn packages using top-level variables into procedures.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/65716&gt;.

Before this change, simply adding the following import:

  modified   gnu/packages/firmware.scm
  @@ -42,6 +42,7 @@ (define-module (gnu packages firmware)
     #:use-module (gnu packages admin)
     #:use-module (gnu packages autotools)
     #:use-module (gnu packages assembly)
  +  #:use-module (gnu packages avr)
     #:use-module (gnu packages backup)
     #:use-module (gnu packages base)
     #:use-module (gnu packages bash)

Would cause byte compilation and/or evaluation to fail due to a circular
module dependency.

* gnu/packages/embedded.scm: Add commentary.
(gcc-arm-none-eabi-4.9, gcc-arm-none-eabi-6, newlib-arm-none-eabi)
(newlib-nano-arm-none-eabi, gcc-arm-none-eabi-7-2018-q2-update)
(newlib-arm-none-eabi-7-2018-q2-update)
(newlib-nano-arm-none-eabi-7-2018-q2-update)
(arm-none-eabi-toolchain-4.9, arm-none-eabi-nano-toolchain-4.9)
(arm-none-eabi-toolchain-6, arm-none-eabi-nano-toolchain-6)
(arm-none-eabi-toolchain-7-2018-q2-update, gdb-arm-none-eabi)
(propeller-binutils, propeller-gcc-6, propeller-gcc-4)
(propeller-gcc, propeller-toolchain, propeller-development-suite)
(gcc-vc4): Turn into procedures, prefixing the procedure name with 'make-',
and adjust all users.
(make-libstdc++-arm-none-eabi) [arguments]: Avoid an unused warning.
(arm-none-eabi-toolchain):  Rename to...
(make-arm-none-eabi-toolchain): ... this.
* gnu/packages/raspberry-pi.scm (raspi-arm-chainloader) [native-inputs]:
Replace gcc-arm-none-eabi-6 with (make-arm-none-eabi-toolchain).
* gnu/packages/axoloti.scm (axoloti-runtime)
[inputs]: Replace arm-none-eabi-nano-toolchain-4.9
with (make-arm-none-eabi-nano-toolchain-4.9).
(axoloti-patcher): Likewise.
(axoloti-patcher-next) [inputs]: Replace
arm-none-eabi-nano-toolchain-7-2018-q2-update
with (make-arm-none-eabi-nano-toolchain-7-2018-q2-update).

Series-changes: 2
- Use mlambda for procedures
</span></span></td><td>Maxim Cournoyer</td></tr>