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-rw-r--r--docs/faq_build.md14
-rw-r--r--docs/getting_started_build_tools.md2
2 files changed, 15 insertions, 1 deletions
diff --git a/docs/faq_build.md b/docs/faq_build.md
index 2d1b91b60d..7d17df0745 100644
--- a/docs/faq_build.md
+++ b/docs/faq_build.md
@@ -104,3 +104,17 @@ brew install dfu-programmer
brew install gcc-arm-none-eabi
brew install avrdude
```
+
+### avr-gcc 8.1 and LUFA
+
+If you updated your avr-gcc to above 7 you may see errors involving LUFA. For example:
+
+`lib/lufa/LUFA/Drivers/USB/Class/Device/AudioClassDevice.h:380:5: error: 'const' attribute on function returning 'void'`
+
+For now, you need to rollback avr-gcc to 7 in brew.
+
+```
+brew uninstall --force avr-gcc
+brew install avr-gcc@7
+brew link avr-gcc@7
+```
diff --git a/docs/getting_started_build_tools.md b/docs/getting_started_build_tools.md
index 45b51b2ccb..c1e02d4e07 100644
--- a/docs/getting_started_build_tools.md
+++ b/docs/getting_started_build_tools.md
@@ -56,7 +56,7 @@ If you're using [homebrew,](http://brew.sh/) you can use the following commands:
brew tap osx-cross/avr
brew tap PX4/homebrew-px4
brew update
- brew install avr-gcc
+ brew install avr-gcc@7
brew install dfu-programmer
brew install gcc-arm-none-eabi
brew install avrdude