lib/pkgconfig/xtst.pc

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

Name: Xtst
Description: The Xtst Library
Version: 1.2.0
Requires: recordproto
Requires.private: x11 xext
Cflags: -I${includedir}
Libs: -L${libdir} -lXtst