prefix=/Applications/SynfigStudio.app/Contents/synfig
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${exec_prefix}/include

Name: libpng12
Description: Loads and saves PNG files
Version: 1.2.5
Libs: -L${libdir} -lpng12 -lz 
Cflags: -I${includedir}/libpng12