FTBFS with GCC 13, missing cstdint header
https://gcc.gnu.org/gcc-13/porting_to.html
Some C++ Standard Library headers have been changed to no longer include other headers that were being used internally by the library.
One place now failing to build due to a missing #include <cstdint>
is
https://gitlab.onelab.info/gmsh/gmsh/-/blob/master/src/mesh/meshGFacePack.cpp#L209