fix even more clang builds

pkgs/development/libraries/libdevil/default.nix

@@ -16,6 +16,15 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--enable-ILU" "--enable-ILUT" ];
 
+  preConfigure = ''
+    sed -i 's, -std=gnu99,,g' configure
+    sed -i 's,malloc.h,stdlib.h,g' src-ILU/ilur/ilur.c
+  '';
+
+  postConfigure = ''
+    sed -i '/RESTRICT_KEYWORD/d' include/IL/config.h
+  '';
+
   patches =
     [ ( fetchurl {
         url = http://patch-tracker.debian.org/patch/series/dl/devil/1.7.8-6.1/03_CVE-2009-3994.diff;

pkgs/servers/x11/xorg/overrides.nix

@@ -102,8 +102,11 @@ in
   # Note: most of these are in Requires.private, so maybe builder.sh
   # should propagate them automatically.
   libXt = attrs: attrs // {
-    preConfigure = setMalloc0ReturnsNullCrossCompiling;
+    preConfigure = setMalloc0ReturnsNullCrossCompiling + ''
+      sed 's,^as_dummy.*,as_dummy="\$PATH",' -i configure
+    '';
     propagatedBuildInputs = [ xorg.libSM ];
+    CPP = stdenv.lib.optionalString stdenv.isDarwin "clang -E -";
   };
 
   # See https://bugs.freedesktop.org/show_bug.cgi?id=47792

pkgs/stdenv/adapters.nix

@@ -299,4 +299,9 @@ rec {
         ''; # */
     in overrideGCC stdenv (stdenv.gcc.override { binutils = binutils'; });
 
+  dropCxx = drv: drv.override {
+    stdenv = if pkgs.stdenv.isDarwin
+      then pkgs.allStdenvs.stdenvDarwinNaked
+      else pkgs.stdenv;
+  };
 }

pkgs/top-level/all-packages.nix

@@ -4574,7 +4574,7 @@ let
 
   coredumper = callPackage ../development/libraries/coredumper { };
 
-  ctl = callPackage ../development/libraries/ctl { };
+  ctl = dropCxx (callPackage ../development/libraries/ctl { });
 
   cpp-netlib = callPackage ../development/libraries/cpp-netlib { };
 
@@ -5079,7 +5079,7 @@ let
 
   ilixi = callPackage ../development/libraries/ilixi { };
 
-  ilmbase = callPackage ../development/libraries/ilmbase { };
+  ilmbase = dropCxx (callPackage ../development/libraries/ilmbase { });
 
   imlib = callPackage ../development/libraries/imlib {
     libpng = libpng12;
@@ -5253,7 +5253,7 @@ let
 
   libdc1394avt = callPackage ../development/libraries/libdc1394avt { };
 
-  libdevil = callPackage ../development/libraries/libdevil { };
+  libdevil = dropCxx (callPackage ../development/libraries/libdevil { });
 
   libdiscid = callPackage ../development/libraries/libdiscid { };
 
@@ -5994,7 +5994,7 @@ let
   # this ctl version is needed by openexr_viewers
   openexr_ctl = callPackage ../development/libraries/openexr_ctl { };
 
-  openexr = callPackage ../development/libraries/openexr { };
+  openexr = dropCxx (callPackage ../development/libraries/openexr { });
 
   openldap = callPackage ../development/libraries/openldap {
     stdenv = if stdenv.isDarwin