diff --git a/pkgs/applications/science/logic/leo2/default.nix b/pkgs/applications/science/logic/leo2/default.nix
index 4087763aa0c5..a72444adbba0 100644
--- a/pkgs/applications/science/logic/leo2/default.nix
+++ b/pkgs/applications/science/logic/leo2/default.nix
@@ -31,6 +31,8 @@ stdenv.mkDerivation rec {
 
   buildFlags = [ "opt" ];
 
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-reserved-user-defined-literal";
+
   preInstall = "mkdir -p $out/bin";
 
   postInstall = ''
@@ -44,7 +46,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "A high-performance typed higher order prover";
     maintainers = [ maintainers.raskin ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     license = licenses.bsd3;
     homepage = "http://www.leoprover.org/";
   };
diff --git a/pkgs/tools/games/weidu/default.nix b/pkgs/tools/games/weidu/default.nix
index f63e5d41d3fe..580eea067031 100644
--- a/pkgs/tools/games/weidu/default.nix
+++ b/pkgs/tools/games/weidu/default.nix
@@ -12,9 +12,7 @@ let
   # 1. Needs ocaml >= 4.04 and <= 4.11 (patched against 4.14)
   # 2. ocaml 4.10 defaults to safe (immutable) strings so we need a version with
   #    that disabled as weidu is strongly dependent on mutable strings
-  ocaml' = ocaml-ng.ocamlPackages_4_14.ocaml.override {
-    unsafeStringSupport = true;
-  };
+  ocaml' = ocaml-ng.ocamlPackages_4_14_unsafe_string.ocaml;
 
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 765682bcc040..387c96dd3d05 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -13700,7 +13700,7 @@ with pkgs;
   wvkbd = callPackage ../applications/accessibility/wvkbd { };
 
   wyrd = callPackage ../tools/misc/wyrd {
-    ocamlPackages = ocaml-ng.ocamlPackages_4_05;
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   x86info = callPackage ../os-specific/linux/x86info { };
@@ -20193,9 +20193,7 @@ with pkgs;
   glpk = callPackage ../development/libraries/glpk { };
 
   glsurf = callPackage ../applications/science/math/glsurf {
-    ocamlPackages = ocaml-ng.mkOcamlPackages (ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    });
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   glui = callPackage ../development/libraries/glui {};
@@ -31564,9 +31562,7 @@ with pkgs;
   mjpg-streamer = callPackage ../applications/video/mjpg-streamer { };
 
   mldonkey = callPackage ../applications/networking/p2p/mldonkey {
-    ocamlPackages = ocaml-ng.mkOcamlPackages (ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    });
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   mlvwm = callPackage ../applications/window-managers/mlvwm { };
@@ -31626,7 +31622,7 @@ with pkgs;
   };
 
   monotoneViz = callPackage ../applications/version-management/monotone-viz {
-    ocamlPackages = ocaml-ng.ocamlPackages_4_05;
+    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
   };
 
   monitor = callPackage ../applications/system/monitor {
@@ -37104,9 +37100,7 @@ with pkgs;
   drat-trim = callPackage ../applications/science/logic/drat-trim {};
 
   ekrhyper = callPackage ../applications/science/logic/ekrhyper {
-    ocaml = ocaml-ng.ocamlPackages_4_14.ocaml.override {
-      unsafeStringSupport = true;
-    };
+    ocaml = ocaml-ng.ocamlPackages_4_14_unsafe_string.ocaml;
   };
 
   eprover = callPackage ../applications/science/logic/eprover { };
@@ -37174,7 +37168,7 @@ with pkgs;
   mathlibtools = with python3Packages; toPythonApplication mathlibtools;
 
   leo2 = callPackage ../applications/science/logic/leo2
-    { inherit (ocaml-ng.ocamlPackages_4_05) ocaml camlp4; };
+    { inherit (ocaml-ng.ocamlPackages_4_14_unsafe_string) ocaml camlp4; };
 
   leo3-bin = callPackage ../applications/science/logic/leo3/binary.nix {};
 
@@ -37221,7 +37215,7 @@ with pkgs;
   };
 
   statverif = callPackage ../applications/science/logic/statverif {
-    inherit (ocaml-ng.ocamlPackages_4_05) ocaml;
+    ocaml = ocaml-ng.ocamlPackages_4_14_unsafe_string.ocaml;
   };
 
   tptp = callPackage ../applications/science/logic/tptp {};
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 967d61aa0a6c..7fb8e255198b 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1692,4 +1692,10 @@ in let inherit (pkgs) callPackage; in rec
   ocamlPackages_latest = ocamlPackages_5_0;
 
   ocamlPackages = ocamlPackages_4_14;
+
+  # We still have packages that rely on unsafe-string, which is deprecated in OCaml 4.06.0.
+  # Below are aliases for porting them to the latest versions of the OCaml 4 series.
+  ocamlPackages_4_14_unsafe_string = mkOcamlPackages (callPackage ../development/compilers/ocaml/4.14.nix {
+    unsafeStringSupport = true;
+  });
 }