Introduce a _real_ configure step (that is: let the ports-magic do the
configuring and building, not the ports shell script). This also makes
the port respect CFLAGS et al.
I'm not sure if PORTREVISION should be bumped...
Port maintainer (olgeni@FreeBSD.org) is cc'd.
How-To-Repeat: Run 'make configure' nothing happens.
Run 'make build' and the port will run autoconf & configure first. And
always with -O2.