Instead:
1. Package makefiles including their own options.mk
2. Packages say "SUBST_CLASSES+=djberrno" to get the hack, if needed
3. Packages adjust SUBST_FILES.djberrno, if needed
Should fix bulk build failures due to multiple inclusions of options.mk
and/or incorrect definitions of DJB_ERRNO_HACK.
Approved during the freeze by wiz@.
fdtools is a set of utilities for working with file descriptors. With
these tools, you can examine and manipulate file descriptor properties
from shell scripts, where without them you might have resorted to a
different language. These tools can rewind file descriptors, switch them
between blocking and nonblocking mode, and examine their inode
information. On some systems (currently only Linux, as far as I know)
they can also allocate, lock, and switch virtual consoles.
