https://codeberg.org/gentoo/gentoo/pulls/884#issuecomment-14921022

Fixes https://github.com/pyside/pyside-setup/commit/2f25d2a3db2ffc4c5e18654138249d285e995d08

--- a/sources/shiboken6_generator/cmake/ShibokenGeneratorSetup.cmake
+++ b/sources/shiboken6_generator/cmake/ShibokenGeneratorSetup.cmake
@@ -36,7 +36,7 @@ compute_config_py_values(shiboken6_VERSION)
 
 shiboken_internal_set_python_site_packages()
 
-string(REGEX REPLACE "\\.[0-9]+\\.[0-9]+$" "" LLVM_VERSION "${LLVM_PACKAGE_VERSION}")
+set(LLVM_VERSION "${LLVM_VERSION_MAJOR}")
 
 set_cmake_cxx_flags()
 set(CMAKE_CXX_FLAGS