[mpech@lambda pkgconfig]$ cat /usr/lib/pkgconfig/libffi.pc 
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
toolexeclibdir=${exec_prefix}/lib/../lib
includedir=${libdir}/libffi-3.2.1/include

Name: libffi
Description: Library supporting Foreign Function Interfaces
Version: 3.2.1
Libs: -L${toolexeclibdir} -lffi
Cflags: -I${includedir}
[mpech@lambda pkgconfig]$