diff --git a/pkgs/servers/http/myserver/default.nix b/pkgs/servers/http/myserver/default.nix
index 87bee922c82..3fbe1ea79ec 100644
--- a/pkgs/servers/http/myserver/default.nix
+++ b/pkgs/servers/http/myserver/default.nix
@@ -32,5 +32,8 @@ let version = "0.9"; in
       license = "GPLv3+";
 
       maintainers = [ stdenv.lib.maintainers.ludo ];
+
+      # libevent fails to build on Cygwin and Guile has troubles on Darwin.
+      platforms = stdenv.lib.platforms.gnu;
     };
   }