exit 1

		fi

		eval "with_$2=0"

		return 0

	fi

	eval "res=\$$2"

	log 2 "  trying $res... found"

	log 1 "checking $2... found"

}

detect_zlib() {

	detect_library "$with_zlib" "zlib" "libz.a" "" "zlib.h"

}

detect_lzo2() {

	detect_library "$with_lzo2" "lzo2" "liblzo2.a" "lzo/" "lzo1x.h"

}

detect_libtimidity() {

}

detect_png() {

	# 0 means no, 1 is auto-detect, 2 is force

	if [ "$with_png" = "0" ]; then

		log 1 "checking libpng... disabled"

		png_config=""

		return 0

	fi

	if [ "$with_zlib" = "0" ] || [ -z "$zlib" ]; then

		if [ "$with_png" != "1" ]; then

			log 1 "checking libpng... no zlib"

			log 1 "ERROR: libpng was forced, but zlib was not detected / disabled."

			log 1 "ERROR: libpng depends on zlib."

			exit 1

		fi

		log 1 "checking libpng... no zlib, skipping"

		png_config=""

		return 0