diff --git a/pkgs/development/libraries/libtermkey/default.nix b/pkgs/development/libraries/libtermkey/default.nix
index 9779ad6b9e5..a96baf0d9f3 100644
--- a/pkgs/development/libraries/libtermkey/default.nix
+++ b/pkgs/development/libraries/libtermkey/default.nix
@@ -2,7 +2,6 @@
 
 stdenv.mkDerivation rec {
   pname = "libtermkey";
-
   version = "0.22";
 
   src = fetchzip {
@@ -10,12 +9,13 @@ stdenv.mkDerivation rec {
     sha256 = "02dks6bj7n23lj005yq41azf95wh3hapmgc2lzyh12vigkjh67rg";
   };
 
-  makeFlags = [ "PREFIX=$(out)" ]
-    ++ lib.optional stdenv.isDarwin "LIBTOOL=${libtool}/bin/libtool";
+  makeFlags = [ "PREFIX=$(out)" "LIBTOOL=${libtool}/bin/libtool" ];
 
   nativeBuildInputs = [ libtool pkg-config ];
   buildInputs = [ ncurses unibilium ];
 
+  strictDeps = true;
+
   meta = with lib; {
     description = "Terminal keypress reading library";
     homepage = "http://www.leonerd.org.uk/code/libtermkey";