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-rw-r--r--FAQ-Build.md12
1 files changed, 11 insertions, 1 deletions
diff --git a/FAQ-Build.md b/FAQ-Build.md
index 41557d2ddb..c3f168a719 100644
--- a/FAQ-Build.md
+++ b/FAQ-Build.md
@@ -91,4 +91,14 @@ SUBSYSTEMS=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="2ff0", MODE:="066
```
# tmk keyboard products https://github.com/tmk/tmk_keyboard
SUBSYSTEMS=="usb", ATTRS{idVendor}=="feed", MODE:="0666"
-``` \ No newline at end of file
+```
+
+
+
+## Cortex: cstddef: No such file or directory
+GCC 4.8 of Ubuntu 14.04 had this problem and had to update to 4.9 with this PPA.
+https://launchpad.net/~terry.guo/+archive/ubuntu/gcc-arm-embedded
+
+https://github.com/tmk/tmk_keyboard/issues/212
+https://github.com/tmk/tmk_keyboard/wiki/mbed-cortex-porting#compile-error-cstddef
+https://developer.mbed.org/forum/mbed/topic/5205/ \ No newline at end of file