[root@localhost wallpaper]# make
compiling : wallpaper.c -> build/libwallpaper.loPackage libpng was not found in the pkg-config search path.
Perhaps you should add the directory containing `libpng.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libpng', required by 'beryl', not found
/bin/sh: libtool: command not found
make: *** [build/libwallpaper.lo] Error 127