diff --git a/Formula/ghostscript.rb b/Formula/ghostscript.rb
index 33fde65ddf..15dd645b7c 100644
--- a/Formula/ghostscript.rb
+++ b/Formula/ghostscript.rb
@@ -44,7 +44,7 @@ class Ghostscript < Formula
   def install
     ENV.deparallelize
     # ghostscript configure ignores LDFLAGs apparently
-    ENV['LIBS'] = "-L#{MacOS::X11.lib}"
+    ENV['LIBS'] = "-L#{MacOS::X11.lib}" if MacOS::X11.installed?
 
     src_dir = build.head? ? "gs" : "."