graphics/png does not build with lang/gcc

[Mark Linimon]

On Wed, Mar 07, 2012 at 06:19:51PM +0200, Andriy Gapon wrote:
> BTW, our traditional taxonomy seems to be: "USE_XXX" is for stuff that ports
> really require, "WITH_XXX" is for user preferences.

This isn't a taxonomy suggestion, it's a documented requirement:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/makefile-depend.html#USE-VARS

This often trips up users.  See the (Note).

If there are lurking uses of WITH_ or WITHOUT_ in port Makefiles where
USE_ is intended, they are bugs.

mcl