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-rw-r--r--nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix8
1 files changed, 4 insertions, 4 deletions
diff --git a/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix b/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
index b2245ff9c9b9..ec2c9eeb2d1c 100644
--- a/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
+++ b/nixpkgs/pkgs/development/tools/parsing/flex/2.5.35.nix
@@ -16,10 +16,10 @@ stdenv.mkDerivation {
 
   propagatedBuildInputs = [ m4 ];
 
-  preConfigure = lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-    "ac_cv_func_malloc_0_nonnull=yes"
-    "ac_cv_func_realloc_0_nonnull=yes"
-  ];
+  preConfigure = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
+    ac_cv_func_malloc_0_nonnull=yes
+    ac_cv_func_realloc_0_nonnull=yes
+  '';
 
   doCheck = false; # fails 2 out of 46 tests