diff --git a/Build.md b/Build.md
index 0f43383..af5f6b0 100644
--- a/Build.md
+++ b/Build.md
@@ -24,14 +24,6 @@ cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/path/to/clan
 cmake --build Release
 ```
 
-For mac users with brew
-```
-brew info llvm
-cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/usr/local/Cellar/llvm/<Your Version>/lib/cmake
-cmake --build Release
-```
-[source](https://github.com/EOSIO/eos/issues/43)
-
 As of 2020-06-23 no pre-built binaries exist for Ubuntu 20.04. `sudo apt-get install clang` and all the other dependencies listed here **excluding** rapidjson-dev (it is vendored in this repo), then run
 ```sh
 cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release \
@@ -229,7 +221,7 @@ Then installing `libncurses5` with `sudo apt install libncurses5` can fix the pr
 Older versions (6.x) use an older GNU libc which requires
 `-DCMAKE_CXX_FLAGS=-D__STDC_FORMAT_MACROS`
 
-### MacOS
+### macOS
 
 To install ccls with Homebrew:
 ```sh
@@ -237,25 +229,26 @@ brew update
 brew install ccls
 ```
 
-To build from source you need MacOS 10.12 (Sierra) or higher to get a version
-of Xcode with a sufficiently-new Clang.
-
-To build using MacPorts Clang add CMake flags
-```sh
--DCMAKE_CXX_COMPILER=clang++-mp-6.0
--DCMAKE_PREFIX_PATH=/opt/local/libexec/llvm-6.0
-```
-
-See https://github.com/MaskRay/ccls/issues/512 , use a [shell script wrapper](Install#shell-script-wrapper):
-
+Homebrew clang is a bit different from `/usr/bin/clang`.
+Invoke `clang++ -xc++ -fsyntax-only -v /dev/null` to get a list of C/C++ search paths.
+Add them as `-isystem` into the [shell script wrapper](Install#shell-script-wrapper). For example:
 ```sh
 #!/bin/sh
-exec /path/to/ccls/Release/ccls -init='{"clang":{"extraArgs":["-isystem", "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include"]}}' "$@"
+exec /opt/homebrew/bin/ccls --init='{"clang":{"extraArgs":[
+  "-isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1",
+  "-isystem/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.5/include",
+  "-isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include",
+  "-isystem/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include",
+  "-isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks"
+]}}' "$@"
 ```
 
-With clang < 8, `"-isystem", "/Library/Developer/CommandLineTools/usr/include/c++/v1"` is also needed (https://github.com/MaskRay/ccls/issues/191#issuecomment-453809905)
-
-With most recent MacOSs(e.g. Catalina 10.15.2), one more clang.extraArgs is needed to make ccls work properly (https://github.com/MaskRay/ccls/issues/512#issuecomment-545575369)
+To build from source:
+```sh
+brew info llvm
+cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/usr/local/Cellar/llvm/<Your Version>/lib/cmake
+cmake --build Release
+```
 
 ### FreeBSD