gentoo-overlay/media-libs/libid3tag/files/id3tag.pc

prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: id3tag
Description: ID3 tag reading library
Requires:
Version: 0.15.0b
Libs: -L${libdir} -lid3tag -lz
Cflags: -I${includedir}