* Fix Darwin evaluation errors.

svn path=/nixpkgs/trunk/; revision=8709

pkgs/applications/version-management/git/default.nix

@@ -11,6 +11,6 @@ stdenv.mkDerivation {
   buildInputs = [curl openssl zlib expat];
 
   preBuild = "
-    makeFlagsArray=(prefix=$out PERL_PATH=${perl}/bin/perl SHELL_PATH=${stdenv.bash}/bin/sh)
+    makeFlagsArray=(prefix=$out PERL_PATH=${perl}/bin/perl SHELL_PATH=${stdenv.shell}/bin/sh)
   ";
 }

pkgs/os-specific/linux/iputils/default.nix

@@ -1,5 +1,7 @@
 {stdenv, fetchurl, kernelHeaders, glibc}:
 
+assert stdenv.isLinux;
+
 stdenv.mkDerivation {
   name = "iputils";
   builder = ./builder.sh;

pkgs/os-specific/linux/libcap/default.nix

@@ -1,5 +1,7 @@
 {stdenv, fetchurl}:
 
+assert stdenv.isLinux;
+
 stdenv.mkDerivation {
   name = "libcap-1.10";
   src = fetchurl {