Log Message:
biology/canu: don't try to chmod system binaries

/usr/bin/chmod -R g-w /home/pbulk/build/biology/canu/work
chmod: WARNING: can't change /home/pbulk/build/biology/canu/work/.gcc/bin/cc
chmod: WARNING: can't change /home/pbulk/build/biology/canu/work/.gcc/bin/g++

Just good that serious pkgsrc builds are run as an unprivileged user,
with no chance of bricking the whole operating system.