Re: [hackers] [st][PATCH 21/24] avoid unnecessarily linking to the math library, and detect openbsd automatically in makefile

[Stephen Gregoratto]

The Makefiles for projects here are written for POSIX make to ensure 
maximum portability. Thus, extension like +=, ifeq/else and friends are 
not allowed. This is why projects ship with config.mk, so that the user 
can patch in these features locally.
-- 
Stephen Gregoratto