An Introduction to GCC for the GNU Compilers gcc and g++ #2

In general, the compiler option ‘-lNAME’ will attempt to link object files with a library file ‘libNAME.a’ in the standard library directories.

On systems supporting both 64 and 32-bit executables, the 64-bit versions of the libraries will often be stored in ‘/usr/lib64’ and ‘/lib64’, with the 32-bit versions in ‘/usr/lib’ and ‘/lib’.