Originally Posted by R. Belmont
The -Wno-narrowing means a non-MAMEdev GCC 4.7.0 or later is in the $(PATH), and at that point all other errors are to be ignored.

Or it means you're on linux with a gentoo-stable version of the compiler:
gcc version 4.5.3 (Gentoo 4.5.3-r2 p1.1, pie-0.4.7)

OG.