diff --git a/configure.ac b/configure.ac
index 2d84317..71fcbb4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -223,12 +223,14 @@ case $fltk_version in
          LIBFLTK_CXXFLAGS=`$FLTK_CONFIG --cxxflags`
          LIBFLTK_CFLAGS=`$FLTK_CONFIG --cflags`
          LIBFLTK_LIBS=`$FLTK_CONFIG --ldflags`;;
-  1.4.*) AC_MSG_RESULT(no)
-         AC_MSG_ERROR([FLTK $fltk_version not supported yet; use FLTK 1.3]);;
+  1.4.*) AC_MSG_RESULT(yes)
+         LIBFLTK_CXXFLAGS=`$FLTK_CONFIG --cxxflags`
+         LIBFLTK_CFLAGS=`$FLTK_CONFIG --cflags`
+         LIBFLTK_LIBS=`$FLTK_CONFIG --ldflags`;;
   ?*)    AC_MSG_RESULT(no)
-         AC_MSG_ERROR(FLTK 1.3 required; version found: $fltk_version);;
+         AC_MSG_ERROR(FLTK 1.3 or 1.4 required; version found: $fltk_version);;
   *)     AC_MSG_RESULT(no)
-         AC_MSG_ERROR(FLTK 1.3 required; fltk-config not found)
+         AC_MSG_ERROR(FLTK 1.3 or 1.4 required; fltk-config not found)
 esac
 
 dnl -----------------------------------