diff --git a/pkgs/development/compilers/nvidia-cg-toolkit/default.nix b/pkgs/development/compilers/nvidia-cg-toolkit/default.nix
index 06f1d74382e..083b420318c 100644
--- a/pkgs/development/compilers/nvidia-cg-toolkit/default.nix
+++ b/pkgs/development/compilers/nvidia-cg-toolkit/default.nix
@@ -33,10 +33,9 @@ stdenv.mkDerivation rec {
     ensureDir "$out/include/"
     cp -v -r include/Cg/ "$out/include/"
     ensureDir "$out/lib/"
-    [ "$system" = "x86_64-linux" ] && cp -v lib64/* "$out/lib/"
-    [ "$system" = "i686-linux" ] && cp -v lib/* "$out/lib/"
-    for mandir in man1 man3 \
-      ${if stdenv.system == "x86_64-linux" then "manCg" else ""} manCgFX
+    [ "$system" == "x86_64-linux" ] && cp -v lib64/* "$out/lib/"
+    [ "$system" == "i686-linux" ] && cp -v lib/* "$out/lib/"
+    for mandir in man1 man3 manCg manCgFX
     do
         ensureDir "$out/share/man/$mandir/"
         cp -v share/man/$mandir/* "$out/share/man/$mandir/"