diff -purN dillo-2.1.1.orig/configure dillo-2.1.1/configure
--- dillo-2.1.1.orig/configure	2009-12-24 10:20:43.000000000 +0100
+++ dillo-2.1.1/configure	2009-12-24 10:29:18.000000000 +0100
@@ -9000,6 +9000,7 @@ fi
 
 { echo "$as_me:$LINENO: checking FLTK2" >&5
 echo $ECHO_N "checking FLTK2... $ECHO_C" >&6; }
+if test "x$LIBFLTK_LIBS" = "x"; then
 if sh -c "fltk2-config --version" >/dev/null 2>&1
 then { echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6; }
@@ -9012,7 +9013,7 @@ echo "${ECHO_T}no" >&6; }
 echo "$as_me: error: FLTK2 must be installed!" >&2;}
    { (exit 1); exit 1; }; }
 fi
-
+fi
 
 if test "x$enable_jpeg" = "xyes"; then
   if test "${ac_cv_header_jpeglib_h+set}" = set; then