File list of package libgccjit-9-dev in bullseye of architecture amd64
/usr/lib/gcc/x86_64-linux-gnu/9/include/libgccjit++.h /usr/lib/gcc/x86_64-linux-gnu/9/include/libgccjit.h /usr/lib/gcc/x86_64-linux-gnu/9/libgccjit.so /usr/share/doc/libgccjit-9-dev