I just pushed a commit (
https://github.com/google/cctz/commit/5b17020a8e637e459e139e048912ede8ceac7dbf) that may break your build if you're building from head.
The commit moves the includes that you may be using from include/*.h -> include/cctz/*.h. The fix should be pretty easy, depending on your build config, but it's probably something like:
#include "civil_time.h" // OLD
#include "cctz/civil_time.h" // NEW
Sorry about the breakage.
Thanks,
Greg