diff --git a/ext/fox16/extconf.rb b/ext/fox16/extconf.rb
index d9a9a55dc7f3c2c73db0b87e9330407def559e70..ec9664ff9a1e5012e84c73b59828578fd97d3798 100755
--- a/ext/fox16/extconf.rb
+++ b/ext/fox16/extconf.rb
@@ -92,6 +92,7 @@ def do_rake_compiler_setup
   end
   have_library("jpeg", "jpeg_mem_init")
   have_library("tiff", "TIFFSetErrorHandler")
+  have_library("Xft", "XftInit")
   find_library("Xext", "XShmQueryVersion", "/usr/X11R6/lib")
   find_library("X11", "XFindContext", "/usr/X11R6/lib")
   find_library("GL", "glXCreateContext", "/usr/X11R6/lib")