diff --git a/pkgs/by-name/mm/mmh/package.nix b/pkgs/by-name/mm/mmh/package.nix
index 7f9e04b2de40..2dbcea7045ce 100644
--- a/pkgs/by-name/mm/mmh/package.nix
+++ b/pkgs/by-name/mm/mmh/package.nix
@@ -7,21 +7,21 @@
   flex,
 }:
 let
-  rev = "b17ea39dc17e5514f33b3f5c34ede92bd16e208c";
+  rev = "7e93dee44df1a7e8f551a2e408a600b2e90a0974";
 in
 stdenv.mkDerivation {
   pname = "mmh";
-  version = "unstable-2020-08-21";
+  version = "unstable-2023-09-24";
 
   src = fetchurl {
     url = "http://git.marmaro.de/?p=mmh;a=snapshot;h=${rev};sf=tgz";
     name = "mmh-${rev}.tgz";
-    sha256 = "1bqfxafw4l2y46pnsxgy4ji1xlyifzw01k1ykbsjj9p61q3nv6l6";
+    hash = "sha256-t2Qnwtkli+/MDk6uaikS2SIP9LucK64os8kGcn2ytRU=";
   };
 
   postPatch = ''
     substituteInPlace sbr/Makefile.in \
-      --replace "ar " "${stdenv.cc.targetPrefix}ar "
+      --replace-fail "ar " "${stdenv.cc.targetPrefix}ar "
   '';
 
   buildInputs = [ ncurses ];
@@ -30,12 +30,18 @@ stdenv.mkDerivation {
     flex
   ];
 
-  meta = with lib; {
+  # mhl.c:1031:58: error: pointer type mismatch in conditional expression []
+  #  1031 |                 putstr((c1->c_flags & RTRIM) ? rtrim(cp) : cp);
+  NIX_CFLAGS_COMPILE = [ " -Wno-error=incompatible-pointer-types" ];
+
+  enableParallelBuilding = true;
+
+  meta = {
     description = "Set of electronic mail handling programs";
     homepage = "http://marmaro.de/prog/mmh";
-    license = licenses.bsd3;
-    platforms = platforms.unix;
+    license = lib.licenses.bsd3;
+    platforms = lib.platforms.unix;
     broken = stdenv.hostPlatform.isDarwin;
-    maintainers = with maintainers; [ kaction ];
+    maintainers = with lib.maintainers; [ kaction ];
   };
 }