/usr/lib/x86_64-linux-gnu/pkgconfig
Edit: /usr/lib/x86_64-linux-gnu/pkgconfig/libevent_extra.pc (301B)
#libevent pkg-config source file
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libevent_extra
Description: libevent_extra
Version: 2.1.12-stable
Requires:
Conflicts:
Libs: -L${libdir} -levent_extra
Libs.private:
Cflags: -I${includedir}