fam-2.7.0 fails to compile due to a "bug" in the Log.c++ file: The header #include <stdarg.h> is missing. Adding this header it works fine.
Both fam-2.7.0 and fam-2.7.0-r1 compile fine for me. Log.c++ does not need "#include <stdarg.h>" - it is already present in Log.h
reporter : what is your 'emerge info' ?
needinfo