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-rw-r--r--nixpkgs/pkgs/development/compilers/mezzo/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/mezzo/default.nix b/nixpkgs/pkgs/development/compilers/mezzo/default.nix
index 23c75ae28bb7..4f2b081b4db2 100644
--- a/nixpkgs/pkgs/development/compilers/mezzo/default.nix
+++ b/nixpkgs/pkgs/development/compilers/mezzo/default.nix
@@ -28,6 +28,10 @@ stdenv.mkDerivation {
   prePatch = lib.optionalString (check-ocaml-version "4.02") ''
     substituteInPlace myocamlbuild.pre.ml \
     --replace '@1..3' '@1..2+3'
+  ''
+  # Compatibility with PPrint ≥ 20220103
+  + ''
+    substituteInPlace typing/Fact.ml --replace PPrintOCaml PPrint.OCaml
   '';
 
   createFindlibDestdir = true;