cmake error because of no ../external/boehmgc/extra/gc.c

[littleknifefish]

CMake Error at CMakeLists.txt:9 (add_library):
Cannot find source file:

../external/boehmgc/extra/gc.c

Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm .h
.hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .hip .ispc

CMake Error at CMakeLists.txt:9 (add_library):
No SOURCES given to target: libil2cpp