diff --git a/build-mac.sh b/build-mac.sh
new file mode 100755
index 0000000000..69e77c9bc9
--- /dev/null
+++ b/build-mac.sh
@@ -0,0 +1,76 @@
+#!/bin/sh
+set -e
+
+export TMPDIR="$PWD/tmp"
+mkdir -p "$TMPDIR"
+
+if [ "$1" = debug ]; then
+  out=out/Debug
+  flags='
+    is_debug=true
+    is_component_build=true
+    exclude_unwind_tables=false
+    remove_webcore_debug_symbols=false
+    use_thin_lto=false
+    use_lld=false'
+else
+  out=out/Release
+  flags='
+    is_debug=false
+    is_component_build=false
+    exclude_unwind_tables=true
+    remove_webcore_debug_symbols=true
+    use_thin_lto=true
+    use_lld=true'
+fi
+
+if which -s ccache; then
+  export CCACHE_SLOPPINESS=time_macros
+  export CCACHE_BASEDIR="$PWD"
+  export CCACHE_CPP2=yes
+  flags="$flags"'
+   cc_wrapper="ccache"'
+fi
+
+flags="$flags"'
+  is_clang=true
+  linux_use_bundled_binutils=false
+
+  fatal_linker_warnings=false
+  treat_warnings_as_errors=false
+  use_sysroot=false
+
+  fieldtrial_testing_like_official_build=true
+
+  use_cups=false
+  use_dbus=false
+  use_gio=false
+  enable_extensions=true
+  use_platform_icu_alternatives=true
+
+  disable_file_support=true
+  enable_websockets=false
+  disable_ftp_support=true
+  use_kerberos=false
+  disable_brotli_filter=true
+  enable_mdns=false
+  enable_reporting=false
+  include_transport_security_state_preload_list=false
+'
+
+rm -rf "./$out"
+mkdir -p out
+
+if [ ! -f out/gn ]; then
+  rm -rf gn
+  git clone https://gn.googlesource.com/gn
+  cd gn
+  CC=gcc CXX=g++ python build/gen.py
+  CCACHE_CPP2= ninja -C out gn
+  cp out/gn ../out
+  cd ..
+fi
+
+./out/gn gen "$out" --args="$flags"
+
+ninja -C "$out" naive
diff --git a/get-clang-mac.sh b/get-clang-mac.sh
new file mode 100755
index 0000000000..194b591081
--- /dev/null
+++ b/get-clang-mac.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+set -ex
+
+CLANG_REVISION=$(grep -m1 CLANG_REVISION tools/clang/scripts/update.py | cut -d"'" -f2)
+CLANG_SUB_REVISION=$(grep -m1 CLANG_SUB_REVISION tools/clang/scripts/update.py | cut -d= -f2)
+url="https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-$CLANG_REVISION-$CLANG_SUB_REVISION.tgz"
+mkdir -p third_party/llvm-build/Release+Asserts
+cd third_party/llvm-build/Release+Asserts
+curl "$url" -o- | tar xzf -