+dnl Check for gdlib usability.
+save_LIBS="$LIBS"
+AC_CHECK_LIB(gd, gdImageCreate, HAVE_GD=yes, HAVE_GD=no)
+AC_CHECK_HEADER(gd.h, , HAVE_GD=no)
+if test "x$HAVE_GD" = "xyes"; then
+ AC_CHECK_LIB(gd, gdImageCreateTrueColor, HAVE_GD=2, HAVE_GD=1)
+ AC_DEFINE_UNQUOTED(HAVE_GD, $HAVE_GD,
+ [Define to 1 or 2 if you have gd library and header file.])
+ M17N_EXT_LIBS="$M17N_EXT_LIBS gdlib"
+ GD_LD_FLAGS=-lgd
+fi
+LIBS="$save_LIBS"
+AC_SUBST(GD_LD_FLAGS)
+
+dnl Check for libxml2 usability.