diff --git a/pkgs/development/interpreters/j/default.nix b/pkgs/development/interpreters/j/default.nix
index 2da499352b3e..97a8064cc60d 100644
--- a/pkgs/development/interpreters/j/default.nix
+++ b/pkgs/development/interpreters/j/default.nix
@@ -1,37 +1,34 @@
 { lib
 , stdenv
 , fetchFromGitHub
-, bc
-, libedit
-, readline
-, avxSupport ? stdenv.hostPlatform.avxSupport
+, which
+, gmp
+, avx2Support ? stdenv.hostPlatform.avx2Support
 }:
 
 stdenv.mkDerivation rec {
   pname = "j";
-  version = "904-beta-c";
+  version = "9.5.1";
 
   src = fetchFromGitHub {
-    name = "${pname}-source";
     owner = "jsoftware";
     repo = "jsource";
-    rev = "j${version}";
-    hash = "sha256-MzEO/saHEBl1JwVlFC6P2UKm9RZnV7KVrNd9h4cPV/w=";
+    rev = "${version}";
+    hash = "sha256-QRQhE8138+zaGQOdq9xUOrifkVIprzbJWbmMK+WhEOU=";
   };
 
-  buildInputs = [
-    readline
-    libedit
-    bc
-  ];
+  nativeBuildInputs = [ which ];
+  buildInputs = [ gmp ];
 
   patches = [
     ./fix-install-path.patch
   ];
 
+  enableParallelBuilding = true;
+
   dontConfigure = true;
 
-  # emulating build_all.sh configuration variables
+  # Emulate jplatform64.sh configuration variables
   jplatform =
     if stdenv.isDarwin then "darwin"
     else if stdenv.hostPlatform.isAarch then "raspberry"
@@ -41,62 +38,39 @@ stdenv.mkDerivation rec {
   j64x =
     if stdenv.is32bit then "j32"
     else if stdenv.isx86_64 then
-      if (stdenv.isLinux && avxSupport) then "j64avx" else "j64"
+      if stdenv.isLinux && avx2Support then "j64avx2" else "j64"
     else if stdenv.isAarch64 then
       if stdenv.isDarwin then "j64arm" else "j64"
     else "unsupported";
 
+  env.NIX_LDFLAGS = "-lgmp";
+
   buildPhase = ''
     runHook preBuild
-
-    export SRCDIR=$(pwd)
-    export HOME=$TMPDIR
-    export JLIB=$SRCDIR/jlibrary
-    export CC=cc
-
-    cd make2
-
-    patchShebangs .
-
-    j64x="${j64x}" jplatform="${jplatform}" ./build_all.sh
-
-    cp -v $SRCDIR/bin/${jplatform}/${j64x}/* "$JLIB/bin"
-
+    MAKEFLAGS+=" ''${enableParallelBuilding:+-j$NIX_BUILD_CORES}" \
+      jplatform=${jplatform} j64x=${j64x} make2/build_all.sh
+    cp -v bin/${jplatform}/${j64x}/* jlibrary/bin/
     runHook postBuild
   '';
 
-  doCheck = true;
-
-  checkPhase = ''
-    runHook preCheck
-
-    echo "Smoke test"
-    echo 'i. 10' | $JLIB/bin/jconsole | fgrep "0 1 2 3 4 5 6 7 8 9"
-
-    # Now run the real tests
-    pushd $SRCDIR/test
-    for f in *.ijs
-    do
-      echo -n "test $f: "
-      $JLIB/bin/jconsole < $f > /dev/null || echo FAIL && echo PASS
-    done
-    popd
-
-    runHook postCheck
-  '';
-
   installPhase = ''
     runHook preInstall
-
-    mkdir -p "$out/share/j/"
-    cp -r $JLIB/{addons,system} "$out/share/j"
-    cp -r $JLIB/bin "$out"
-
+    mkdir -p $out/share/j
+    cp -r jlibrary/{addons,system} $out/share/j/
+    cp -r jlibrary/bin $out/
     runHook postInstall
   '';
 
+  doInstallCheck = false; # The "gregex" test fails due to not finding PCRE2
+
+  installCheckPhase = ''
+    runHook preInstallCheck
+    HOME="$TMPDIR" $out/bin/jconsole -lib $out/bin/libj* script/testga.ijs
+    runHook postInstallCheck
+  '';
+
   meta = with lib; {
-    homepage = "http://jsoftware.com/";
+    homepage = "https://jsoftware.com/";
     description = "J programming language, an ASCII-based APL successor";
     longDescription = ''
       J is a high-level, general-purpose programming language that is
@@ -104,8 +78,10 @@ stdenv.mkDerivation rec {
       of data. It is a powerful tool for developing algorithms and exploring
       problems that are not already well understood.
     '';
-    license = licenses.gpl3Plus;
+    license = licenses.gpl3Only;
     maintainers = with maintainers; [ raskin synthetica AndersonTorres ];
-    platforms = with platforms; unix;
+    broken = stdenv.isDarwin;
+    platforms = platforms.all;
+    mainProgram = "jconsole";
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1a210d1e0ace..4b33aa976e4d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -17634,9 +17634,7 @@ with pkgs;
 
   ivy = callPackage ../development/interpreters/ivy { };
 
-  j = callPackage ../development/interpreters/j {
-    stdenv = clangStdenv;
-  };
+  j = callPackage ../development/interpreters/j { };
 
   jacinda = haskell.lib.compose.justStaticExecutables haskellPackages.jacinda;