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-rw-r--r--pkgs/tools/text/groff/default.nix5
1 files changed, 4 insertions, 1 deletions
diff --git a/pkgs/tools/text/groff/default.nix b/pkgs/tools/text/groff/default.nix
index a38251557c090..215f7e7d25b83 100644
--- a/pkgs/tools/text/groff/default.nix
+++ b/pkgs/tools/text/groff/default.nix
@@ -5,6 +5,7 @@
 , autoreconfHook
 , pkg-config
 , texinfo
+, bison
 , bash
 }:
 
@@ -51,7 +52,9 @@ stdenv.mkDerivation rec {
   '';
 
   strictDeps = true;
-  nativeBuildInputs = [ autoreconfHook pkg-config texinfo ];
+  nativeBuildInputs = [ autoreconfHook pkg-config texinfo ]
+    # Required due to the patch that changes .ypp files.
+    ++ lib.optional (stdenv.cc.isClang && lib.versionAtLeast stdenv.cc.version "9") bison;
   buildInputs = [ perl bash ]
     ++ lib.optionals enableGhostscript [ ghostscript ]
     ++ lib.optionals enableHtml [ psutils netpbm ];