Binary package “lib64gcc-9-dev” in ubuntu focal
GCC support library (64bit development files)
This package contains the headers and static library files necessary for
building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
This package contains the headers and static library files necessary for
building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.