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This patch has been taken from:


diff -ur fltk-1.3.x-r8659.orig/configure.in fltk-1.3.x-r8659/configure.in
--- fltk-1.3.x-r8659.orig/configure.in	2011-03-07 03:54:58.000000000 +1100
+++ fltk-1.3.x-r8659/configure.in	2011-05-24 22:11:40.000000000 +1000
@@ -34,7 +34,7 @@
 AC_INIT(src/Fl.cxx)
 
 dnl So --with-archflags option is used during "checking size of long"
-if test `uname` = Darwin; then
+if test `uname` = Darwin && test "x$cross_compiling" = xno ; then
   if test "x$with_archflags" != x ; then
     CFLAGS="$CFLAGS $with_archflags"
   fi
