Added missing libpng dependency

build.sh

@@ -18,6 +18,7 @@ cd $BUILD_DIR
 ../fetchurl "http://www.tortall.net/projects/yasm/releases/yasm-1.0.1.tar.gz"
 ../fetchurl "http://zlib.net/zlib-1.2.5.tar.bz2"
 ../fetchurl "http://www.bzip.org/1.0.5/bzip2-1.0.5.tar.gz"
+../fetchurl "http://downloads.sourceforge.net/project/libpng/03-libpng-previous/1.2.44/libpng-1.2.44.tar.bz2"
 ../fetchurl "http://downloads.xiph.org/releases/ogg/libogg-1.2.0.tar.gz"
 ../fetchurl "http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.1.tar.bz2"
 ../fetchurl "http://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.bz2"
@@ -43,6 +44,11 @@ cd "$BUILD_DIR/bzip2-1.0.5"
 make
 make install PREFIX=$TARGET_DIR
 
+echo "*** Building libpng ***"
+cd "$BUILD_DIR/libpng-1.2.44"
+./configure --prefix=$TARGET_DIR --enable-static --disable-shared
+make -j 4 && make install
+
 # Ogg before vorbis
 echo "*** Building libogg ***"
 cd "$BUILD_DIR/libogg-1.2.0"