diff --git a/pkgs/development/compilers/ghc/9.12.4.nix b/pkgs/development/compilers/ghc/9.12.4.nix
new file mode 100644
index 000000000000..284a98e7355f
--- /dev/null
+++ b/pkgs/development/compilers/ghc/9.12.4.nix
@@ -0,0 +1,4 @@
+import ./common-hadrian.nix {
+  version = "9.12.4";
+  sha256 = "02d1ee5080acf00e135b93b238f09015b06ff27254cde59669cf57c42c2bee43";
+}
diff --git a/pkgs/development/compilers/ghc/common-hadrian.nix b/pkgs/development/compilers/ghc/common-hadrian.nix
index d5f8092cf374..8f2541bea009 100644
--- a/pkgs/development/compilers/ghc/common-hadrian.nix
+++ b/pkgs/development/compilers/ghc/common-hadrian.nix
@@ -321,22 +321,34 @@
       ]
 
       # Fix docs build with Sphinx >= 9 https://gitlab.haskell.org/ghc/ghc/-/issues/26810
-      ++ lib.optionals (lib.versionOlder version "9.15.20260129") [
-        ./ghc-9.6-or-later-docs-sphinx-9.patch
-      ]
+      ++
+        lib.optionals
+          (
+            lib.versionOlder version "9.12.4"
+            || (lib.versionAtLeast version "9.14" && lib.versionOlder version "9.15.20260129")
+          )
+          [
+            ./ghc-9.6-or-later-docs-sphinx-9.patch
+          ]
 
       # Fixes rts/Types.h missing from the install when targeting javascript
       # See https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15740, krank:ignore-line
       # https://gitlab.haskell.org/ghc/ghc/-/issues/27033. krank:ignore-line
-      # TODO(@sternenseemann): patch likely included in 9.12.4
-      ++ lib.optionals (lib.versionAtLeast version "9.12.3" && lib.versionOlder version "9.15") [
-        (fetchpatch {
-          name = "ghc-9.12.3-ghcjs-install-rts-types.h.patch";
-          url = "https://gitlab.haskell.org/ghc/ghc/-/commit/5b1be555be4f0989d78c274991c5046d7ac6d25e.patch";
-          hash = "sha256-pv4NDyQ6FlZgmTYZ4Ghis4qggt7nCDMhqGaFxTxVPac=";
-          includes = [ "rts/rts.cabal" ];
-        })
-      ]
+      ++
+        lib.optionals
+          (
+            version == "9.12.3"
+            # TODO(@sternenseemann): 9.14.2 will likely also have this patch
+            || (lib.versionAtLeast version "9.14" && lib.versionOlder version "9.15.20260127")
+          )
+          [
+            (fetchpatch {
+              name = "ghc-9.12.3-ghcjs-install-rts-types.h.patch";
+              url = "https://gitlab.haskell.org/ghc/ghc/-/commit/5b1be555be4f0989d78c274991c5046d7ac6d25e.patch";
+              hash = "sha256-pv4NDyQ6FlZgmTYZ4Ghis4qggt7nCDMhqGaFxTxVPac=";
+              includes = [ "rts/rts.cabal" ];
+            })
+          ]
 
       ++ (import ./common-llvm-patches.nix { inherit lib version fetchpatch; });
 
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 949915974dd0..5c5c7fff8c94 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -191,6 +191,14 @@ in
         inherit (buildPackages.darwin) xattr autoSignDarwinBinariesHook;
         inherit buildTargetLlvmPackages llvmPackages;
       };
+      ghc9124 = callPackage ../development/compilers/ghc/9.12.4.nix {
+        bootPkgs =
+          # No suitable bindist packaged yet
+          bb.packages.ghc9103;
+        inherit (buildPackages.python3Packages) sphinx;
+        inherit (buildPackages.darwin) xattr autoSignDarwinBinariesHook;
+        inherit buildTargetLlvmPackages llvmPackages;
+      };
       ghc9141 = callPackage ../development/compilers/ghc/9.14.1.nix {
         bootPkgs =
           # No suitable bindist packaged yet
@@ -295,6 +303,11 @@ in
         ghc = bh.compiler.ghc9123;
         compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-9.12.x.nix { };
       };
+      ghc9124 = callPackage ../development/haskell-modules {
+        buildHaskellPackages = bh.packages.ghc9124;
+        ghc = bh.compiler.ghc9124;
+        compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-9.12.x.nix { };
+      };
       ghc9141 = callPackage ../development/haskell-modules {
         buildHaskellPackages = bh.packages.ghc9141;
         ghc = bh.compiler.ghc9141;