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-rw-r--r--pkgs/development/tools/misc/hydra/default.nix2
-rw-r--r--pkgs/development/tools/parsing/ragel/default.nix2
2 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index e0ebba4c051..3e5c12e183a 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -102,7 +102,7 @@ in stdenv.mkDerivation rec {
 
   configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];
 
-  NIX_CFLAGS_COMPILE = [ "-pthread" ];
+  NIX_CFLAGS_COMPILE = "-pthread";
 
   shellHook = ''
     PATH=$(pwd)/src/script:$(pwd)/src/hydra-eval-jobs:$(pwd)/src/hydra-queue-runner:$(pwd)/src/hydra-evaluator:$PATH
diff --git a/pkgs/development/tools/parsing/ragel/default.nix b/pkgs/development/tools/parsing/ragel/default.nix
index 2f4db7982b7..12c9b9d57f8 100644
--- a/pkgs/development/tools/parsing/ragel/default.nix
+++ b/pkgs/development/tools/parsing/ragel/default.nix
@@ -21,7 +21,7 @@ let
 
       configureFlags = [ "--with-colm=${colm}" ];
 
-      NIX_CFLAGS_COMPILE = stdenv.lib.optional stdenv.cc.isGNU "-std=gnu++98";
+      NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isGNU "-std=gnu++98";
 
       doCheck = true;