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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/build/unix/build-gcc/build-gcc.sh b/build/unix/build-gcc/build-gcc.sh
new file mode 100755
index 0000000000..0a27af1ecd
--- /dev/null
+++ b/build/unix/build-gcc/build-gcc.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -e
+set -x
+
+make_flags="-j$(nproc)"
+
+apply_patch() {
+  if [ $# -ge 2 ]; then
+    pushd $root_dir/$1
+    shift
+  else
+    pushd $root_dir/gcc-source
+  fi
+  patch -p1 < $1
+  popd
+}
+
+build_binutils() {
+  # if binutils_configure_flags is not set at all, give it the default value
+  if [ -z "${binutils_configure_flags+xxx}" ];
+  then
+    # gold is disabled because we don't use it on automation, and also we ran into
+    # some issues with it using this script in build-clang.py.
+    #
+    # --enable-targets builds extra target support in ld.
+    # Enabling aarch64 support brings in arm support, so we don't need to specify that too.
+    #
+    # It is important to have the binutils --target and the gcc --target match,
+    # so binutils will install binaries in a place that gcc will look for them.
+    binutils_configure_flags="--enable-targets=aarch64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --disable-gold --enable-plugins --disable-nls --with-sysroot=/"
+  fi
+
+  mkdir $root_dir/binutils-objdir
+  pushd $root_dir/binutils-objdir
+  ../binutils-source/configure --prefix=${prefix-/tools/gcc}/ $binutils_configure_flags
+  make $make_flags
+  make install $make_flags DESTDIR=$root_dir
+  export PATH=$root_dir/${prefix-/tools/gcc}/bin:$PATH
+  popd
+}
+
+build_gcc() {
+  # Be explicit about --build and --target so header and library install
+  # directories are consistent.
+  local target="${1:-x86_64-unknown-linux-gnu}"
+
+  mkdir $root_dir/gcc-objdir
+  pushd $root_dir/gcc-objdir
+
+  if [ -d $MOZ_FETCHES_DIR/sysroot ]; then
+    EXTRA_CONFIGURE_FLAGS="--with-build-sysroot=$MOZ_FETCHES_DIR/sysroot"
+    export CFLAGS_FOR_BUILD="--sysroot=$MOZ_FETCHES_DIR/sysroot"
+  fi
+  ../gcc-source/configure --prefix=${prefix-/tools/gcc} --build=x86_64-unknown-linux-gnu --target="${target}" --enable-languages=c,c++  --disable-nls --disable-gnu-unique-object --enable-__cxa_atexit --with-arch-32=pentiumpro --with-sysroot=/ $EXTRA_CONFIGURE_FLAGS
+  make $make_flags
+  make $make_flags install-strip DESTDIR=$root_dir
+
+  cd $root_dir/tools
+  ln -s gcc gcc/bin/cc
+
+  tar caf $root_dir/gcc.tar.zst gcc/
+  popd
+}