pkg-config generated files broken

[sergiotarxz]

/usr/local/lib64/pkgconfig/edelib-gui.pc contents:

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

Name: edelib-gui
Description: EDE GUI library
Version: 2.2.0
Requires: edelib
Libs: -L${libdir} -ledelib_gui -L/usr/lib64/fltk -Wl,-rpath,/usr/lib64/fltk -L/usr/lib64/fltk -lfltk_images -lpng -lz -ljpeg -lfltk -lXrender -lXcursor -lXfixes -lXext -lXft -lfontconfig -lXinerama -lpthread -lm -lX11 -lXpm 
Cflags: -I${includedir} -I/usr/include/fltk -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT

Those ${} are expanding to empty strings somehow and this causes this kind of broken output that break compilations:

sergio@ayasel ~/ede/edelib $ PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig/ pkg-config --libs-only-L edelib-gui
-L -L/usr/lib64/fltk

[sergiotarxz]

This issue sounds like a tomorrow problem to me because it is too late and I am sleepy after trying to make work ede with fltk 1.3.x