diff -U2 -r mathgl-1.6.2.orig/configure.ac mathgl-1.6.2/configure.ac
--- mathgl-1.6.2.orig/configure.ac	2008-04-03 01:24:42.000000000 +0700
+++ mathgl-1.6.2/configure.ac	2008-05-12 10:05:54.000000000 +0700
@@ -144,11 +144,21 @@
   *) AC_MSG_ERROR(bad value ${enableval} for --enable-fltk) ;;
 esac],[fltk=false])
-AC_CHECK_HEADER(FL/Fl_Export.H,[(test x$all = xtrue || test x$fltk = xtrue) && FLTK_FLAGS=-DHAVE_FLTK AC_SUBST(FLTK_FLAGS)],
-    [(test x$all = xtrue || test x$fltk = xtrue) && echo "Please install fltk headers" && exit])
 
-AC_CHECK_LIB([fltk], [main], [(test x$all = xtrue || test x$fltk = xtrue) && FLTK_LIBS="-lfltk -lfltk_images" AC_SUBST(FLTK_LIBS)],
-    [(test x$all = xtrue || test x$fltk = xtrue) && echo "Please install fltk library" && exit])
-AM_CONDITIONAL(USE_FLTK, (test x$all = xtrue || test x$fltk = xtrue))
+if test x$all = xtrue || test x$fltk = xtrue
+then
+    AC_PATH_PROG([FLTKCONFIG],[fltk-config])
+    if test -n "$FLTKCONFIG"
+    then
+        FLTK_FLAGS="-DHAVE_FLTK `$FLTKCONFIG --cflags`"
+        FLTK_LIBS=`$FLTKCONFIG --use-images --ldflags`
+        AC_SUBST(FLTK_FLAGS)
+        AC_SUBST(FLTK_LIBS)],
+    else
+        echo "Please install fltk"
+        exit
+    fi
+fi
 
+AM_CONDITIONAL(USE_FLTK, (test x$all = xtrue || test x$fltk = xtrue))
 
 AC_OUTPUT(Makefile mgl/Makefile utils/Makefile include/Makefile examples/Makefile)
diff -U2 -r mathgl-1.6.2.orig/examples/Makefile.am mathgl-1.6.2/examples/Makefile.am
--- mathgl-1.6.2.orig/examples/Makefile.am	2008-04-03 01:24:42.000000000 +0700
+++ mathgl-1.6.2/examples/Makefile.am	2008-05-12 08:18:40.000000000 +0700
@@ -19,5 +19,5 @@
 mgl_fltk_example_SOURCES = fltk_example.cpp
 mgl_fltk_example_LDADD = $(top_builddir)/mgl/libmgl-fltk.la
-mgl_fltk_example_CFLAGS = -O2
+mgl_fltk_example_CFLAGS = -O2 $(FLTK_FLAGS)
 mgl_fltk_example_CPPFLAGS = $(mgl_fltk_example_CFLAGS)
 endif