-_TUXBOX_APPS_LIB_PKGCONFIG(GSTREAMER,gstreamer)
-
-if test -z "$GSTREAMER_CFLAGS" ; then
- AC_MSG_WARN([could not find package GSTREAMER]);
-else
- AC_DEFINE_UNQUOTED([HAVE_GSTREAMER],1,[Define to 1 if you have gstreamer])
-fi
+_TUXBOX_APPS_LIB_PKGCONFIG_OPTIONAL(GSTREAMER,gstreamer,HAVE_GSTREAMER)
+AC_CHECK_LIB(jpeg, jpeg_set_defaults, HAVE_JPEG="yes", HAVE_JPEG="no")
+JPEG_LIBS="-ljpeg"
+AC_SUBST(JPEG_LIBS)