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-rw-r--r--pkgs/development/tools/parsing/ragel/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/parsing/ragel/default.nix b/pkgs/development/tools/parsing/ragel/default.nix
index 6bbcf36cd2c22..c23b352deceaf 100644
--- a/pkgs/development/tools/parsing/ragel/default.nix
+++ b/pkgs/development/tools/parsing/ragel/default.nix
@@ -15,7 +15,7 @@ let
 
       buildInputs = lib.optional build-manual [ transfig ghostscript tex ];
 
-      preConfigure = lib.optional build-manual ''
+      preConfigure = lib.optionalString build-manual ''
         sed -i "s/build_manual=no/build_manual=yes/g" DIST
       '';