QT_FLAGS="-release -thread -shared -qt-gif -platform linux-g++"
### use system graphics libraries
-QT_FLAGS=$QT_FLAGS" -system-libpng -system-libjpeg -system-libmng"
+QT_FLAGS=$QT_FLAGS" -system-libpng -system-libjpeg -system-libmng -lpng -lmng -ljpeg"
### link also with Mesa if it is previously installed
if [ -n "$MESA_HOME" ]; then
QT_FLAGS=$QT_FLAGS" -I${MESA_HOME}/include/GL -L${MESA_HOME}/lib -L/usr/lib -lglide3"