diff --git a/ghc/ghc.spec b/ghc/ghc.spec.in
similarity index 99%
rename from ghc/ghc.spec
rename to ghc/ghc.spec.in
index 779e775a36eeef367d3a7bd5263e353baca24fe3..d32379d3329c8eaeb478ab1ec9ab83732ba4d823 100644
--- a/ghc/ghc.spec
+++ b/ghc/ghc.spec.in
@@ -25,6 +25,7 @@ Source: http://haskell.org/ghc/dist/%{version}/ghc-%{version}-src.tar.gz
 URL: http://haskell.org/ghc/
 BuildRoot: /var/tmp/ghc-%{version}-%{release}-root
 Packager: Manuel M. T. Chakravarty <chak@is.tsukuba.ac.jp>
+Requires: gmp-devel
 Provides: haskell
 
 %description