diff --git a/foundation/src/stages/stage1/default.nix b/foundation/src/stages/stage1/default.nix
index 792f6d7..db057c6 100644
--- a/foundation/src/stages/stage1/default.nix
+++ b/foundation/src/stages/stage1/default.nix
@@ -69,6 +69,8 @@ in {
 
         # These packages are built using Bash v5
         stage1-gcc-46 = stage1.gcc.v46.package;
+        stage1-musl = stage1.musl.package;
+        stage1-gcc-46-cxx = stage1.gcc.v46.cxx.package;
       };
 
       extras = {
diff --git a/foundation/src/stages/stage1/gcc/default.nix b/foundation/src/stages/stage1/gcc/default.nix
index 6b6e4be..12ad6ce 100644
--- a/foundation/src/stages/stage1/gcc/default.nix
+++ b/foundation/src/stages/stage1/gcc/default.nix
@@ -11,6 +11,7 @@
 in {
   includes = [
     ./v4.6.nix
+    ./v4.6.cxx.nix
   ];
 
   options.aux.foundation.stages.stage1.gcc = {
diff --git a/foundation/src/stages/stage1/gcc/v4.6.cxx.nix b/foundation/src/stages/stage1/gcc/v4.6.cxx.nix
new file mode 100644
index 0000000..bf49988
--- /dev/null
+++ b/foundation/src/stages/stage1/gcc/v4.6.cxx.nix
@@ -0,0 +1,187 @@
+{
+  lib,
+  config,
+}: let
+  cfg = config.aux.foundation.stages.stage1.gcc.v46.cxx;
+
+  platform = config.aux.platform;
+  builders = config.aux.foundation.builders;
+
+  stage1 = config.aux.foundation.stages.stage1;
+in {
+  options.aux.foundation.stages.stage1.gcc.v46.cxx = {
+    package = lib.options.create {
+      type = lib.types.package;
+      description = "The package to use for gcc-cxx.";
+    };
+
+    version = lib.options.create {
+      type = lib.types.string;
+      description = "Version of the package.";
+    };
+
+    src = lib.options.create {
+      type = lib.types.package;
+      description = "Source for the package.";
+    };
+
+    cc = {
+      src = lib.options.create {
+        type = lib.types.package;
+        description = "The cc source for the package.";
+      };
+    };
+
+    gmp = {
+      src = lib.options.create {
+        type = lib.types.package;
+        description = "The gmp source for the package.";
+      };
+
+      version = lib.options.create {
+        type = lib.types.string;
+        description = "Version of gmp.";
+      };
+    };
+
+    mpfr = {
+      src = lib.options.create {
+        type = lib.types.package;
+        description = "The mpfr source for the package.";
+      };
+
+      version = lib.options.create {
+        type = lib.types.string;
+        description = "Version of mpfr.";
+      };
+    };
+
+    mpc = {
+      src = lib.options.create {
+        type = lib.types.package;
+        description = "The mpc source for the package.";
+      };
+
+      version = lib.options.create {
+        type = lib.types.string;
+        description = "Version of mpc.";
+      };
+    };
+  };
+
+  config = {
+    aux.foundation.stages.stage1.gcc.v46.cxx = {
+      version = "4.6.4";
+
+      src = builtins.fetchurl {
+        url = "https://ftpmirror.gnu.org/gcc/gcc-${cfg.version}/gcc-core-${cfg.version}.tar.gz";
+        sha256 = "173kdb188qg79pcz073cj9967rs2vzanyjdjyxy9v0xb0p5sad75";
+      };
+
+      cc = {
+        src = builtins.fetchurl {
+          url = "https://ftpmirror.gnu.org/gcc/gcc-${cfg.version}/gcc-g++-${cfg.version}.tar.gz";
+          sha256 = "1fqqk5zkmdg4vmqzdmip9i42q6b82i3f6yc0n86n9021cr7ms2k9";
+        };
+      };
+
+      gmp = {
+        version = "4.3.2";
+
+        src = builtins.fetchurl {
+          url = "https://ftpmirror.gnu.org/gmp/gmp-${cfg.gmp.version}.tar.gz";
+          sha256 = "15rwq54fi3s11izas6g985y9jklm3xprfsmym3v1g6xr84bavqvv";
+        };
+      };
+
+      mpfr = {
+        version = "2.4.2";
+
+        src = builtins.fetchurl {
+          url = "https://ftpmirror.gnu.org/mpfr/mpfr-${cfg.mpfr.version}.tar.gz";
+          sha256 = "0dxn4904dra50xa22hi047lj8kkpr41d6vb9sd4grca880c7wv94";
+        };
+      };
+
+      mpc = {
+        version = "1.0.3";
+
+        src = builtins.fetchurl {
+          url = "https://ftpmirror.gnu.org/mpc/mpc-${cfg.mpc.version}.tar.gz";
+          sha256 = "1hzci2zrrd7v3g1jk35qindq05hbl0bhjcyyisq9z209xb3fqzb1";
+        };
+      };
+
+      package = let
+        patches = [
+          # Remove hardcoded NATIVE_SYSTEM_HEADER_DIR
+          ./patches/no-system-headers.patch
+        ];
+      in
+        builders.bash.build {
+          name = "gcc-cxx-${cfg.version}";
+
+          meta = stage1.gcc.meta;
+
+          deps.build.host = [
+            stage1.gcc.v46.package
+            stage1.binutils.package
+            stage1.gnumake.package
+            stage1.gnupatch.package
+            stage1.gnused.package
+            stage1.gnugrep.package
+            stage1.gawk.boot.package
+            stage1.diffutils.package
+            stage1.findutils.package
+            stage1.gnutar.musl.package
+            stage1.gzip.package
+          ];
+
+          script = ''
+            # Unpack
+            tar xzf ${cfg.src}
+            tar xzf ${cfg.cc.src}
+            tar xzf ${cfg.gmp.src}
+            tar xzf ${cfg.mpfr.src}
+            tar xzf ${cfg.mpc.src}
+            cd gcc-${cfg.version}
+
+            ln -s ../gmp-${cfg.gmp.version} gmp
+            ln -s ../mpfr-${cfg.mpfr.version} mpfr
+            ln -s ../mpc-${cfg.mpc.version} mpc
+
+            # Patch
+            ${lib.strings.concatMapSep "\n" (file: "patch -Np1 -i ${file}") patches}
+            # doesn't recognise musl
+            sed -i 's|"os/gnu-linux"|"os/generic"|' libstdc++-v3/configure.host
+
+            # Configure
+            export CC="gcc -Wl,-dynamic-linker -Wl,${stage1.musl.package}/lib/libc.so"
+            export CFLAGS_FOR_TARGET="-Wl,-dynamic-linker -Wl,${stage1.musl.package}/lib/libc.so"
+            export C_INCLUDE_PATH="${stage1.musl.package}/include"
+            export CPLUS_INCLUDE_PATH="$C_INCLUDE_PATH"
+            export LIBRARY_PATH="${stage1.musl.package}/lib"
+
+            bash ./configure \
+              --prefix=$out \
+              --build=${platform.build} \
+              --host=${platform.host} \
+              --with-native-system-header-dir=${stage1.musl.package}/include \
+              --with-build-sysroot=${stage1.musl.package} \
+              --enable-languages=c,c++ \
+              --disable-bootstrap \
+              --disable-libmudflap \
+              --disable-libstdcxx-pch \
+              --disable-lto \
+              --disable-multilib
+
+            # Build
+            make -j $NIX_BUILD_CORES
+
+            # Install
+            make -j $NIX_BUILD_CORES install
+          '';
+        };
+    };
+  };
+}
diff --git a/foundation/src/stages/stage1/gcc/v4.6.nix b/foundation/src/stages/stage1/gcc/v4.6.nix
index b81d893..96ff1a9 100644
--- a/foundation/src/stages/stage1/gcc/v4.6.nix
+++ b/foundation/src/stages/stage1/gcc/v4.6.nix
@@ -126,7 +126,7 @@ in {
           deps.build.host = [
             stage1.tinycc.musl.compiler.package
             stage1.binutils.package
-            stage1.gnumake.boot.package
+            stage1.gnumake.package
             stage1.gnupatch.package
             stage1.gnused.package
             stage1.gnugrep.package
@@ -193,18 +193,10 @@ in {
               --disable-build-with-cxx
 
             # Build
-            # FIXME: This throws an error when called with more than a single job core.
-            # The error is "line 6:  5629 Alarm clock" which seems to be timeout related.
-            #
-            # make -j $NIX_BUILD_CORES
-            make
+            make -j $NIX_BUILD_CORES
 
             # Install
-            # FIXME: This throws an error when called with more than a single job core.
-            # The error is "line 6:  5629 Alarm clock" which seems to be timeout related.
-            #
-            # make -j $NIX_BUILD_CORES install
-            make install
+            make -j $NIX_BUILD_CORES install
           '';
         };
     };
diff --git a/foundation/src/stages/stage1/musl/default.nix b/foundation/src/stages/stage1/musl/default.nix
index 2ebfde9..ba25edb 100644
--- a/foundation/src/stages/stage1/musl/default.nix
+++ b/foundation/src/stages/stage1/musl/default.nix
@@ -4,6 +4,7 @@
 }: let
   cfg = config.aux.foundation.stages.stage1.musl;
 
+  platform = config.aux.platform;
   builders = config.aux.foundation.builders;
 
   stage1 = config.aux.foundation.stages.stage1;
@@ -13,6 +14,21 @@ in {
   ];
 
   options.aux.foundation.stages.stage1.musl = {
+    package = lib.options.create {
+      type = lib.types.package;
+      description = "The package to use for musl.";
+    };
+
+    version = lib.options.create {
+      type = lib.types.string;
+      description = "Version of the package.";
+    };
+
+    src = lib.options.create {
+      type = lib.types.package;
+      description = "Source for the package.";
+    };
+
     meta = {
       description = lib.options.create {
         type = lib.types.string;
@@ -41,4 +57,63 @@ in {
       };
     };
   };
+
+  config = {
+    aux.foundation.stages.stage1.musl = {
+      version = "1.2.4";
+
+      src = builtins.fetchurl {
+        url = "https://musl.libc.org/releases/musl-${cfg.version}.tar.gz";
+        sha256 = "ejXq4z1TcqfA2hGI3nmHJvaIJVE7euPr6XqqpSEU8Dk=";
+      };
+
+      package = builders.bash.build {
+        name = "musl-${cfg.version}";
+
+        meta = cfg.meta;
+
+        deps.build.host = [
+          stage1.gcc.v46.package
+          stage1.binutils.package
+          stage1.gnumake.package
+          stage1.gnused.package
+          stage1.gnugrep.package
+          stage1.gnutar.package
+          stage1.gzip.package
+        ];
+
+        script = ''
+          # Unpack
+          tar xzf ${cfg.src}
+          cd musl-${cfg.version}
+
+          # Patch
+          # https://github.com/ZilchOS/bootstrap-from-tcc/blob/2e0c68c36b3437386f786d619bc9a16177f2e149/using-nix/2a3-intermediate-musl.nix
+          sed -i 's|/bin/sh|${stage1.bash.package}/bin/bash|' \
+            tools/*.sh
+          # patch popen/system to search in PATH instead of hardcoding /bin/sh
+          sed -i 's|posix_spawn(&pid, "/bin/sh",|posix_spawnp(\&pid, "sh",|' \
+            src/stdio/popen.c src/process/system.c
+          sed -i 's|execl("/bin/sh", "sh", "-c",|execlp("sh", "-c",|'\
+            src/misc/wordexp.c
+
+          # Configure
+          bash ./configure \
+            --prefix=$out \
+            --build=${platform.build} \
+            --host=${platform.host} \
+            --syslibdir=$out/lib \
+            --enable-wrapper
+
+          # Build
+          make -j $NIX_BUILD_CORES
+
+          # Install
+          make -j $NIX_BUILD_CORES install
+          sed -i 's|/bin/sh|${stage1.bash.package}/bin/bash|' $out/bin/*
+          ln -s ../lib/libc.so $out/bin/ldd
+        '';
+      };
+    };
+  };
 }