build-qmail - build binary qmail package
This script unpacks the qmail 1.0.3 source into a directory, and
compiles it to produce a binary qmail-1.0.3??.deb file.
The directory where this is done will end up containing the source and
package files for the $package binary package, along with a directory
containing the unpacked source.
WARNING: There have been reports of undesired behavior when attempting
to build qmail in a directory on a tmpfs based filesystem. Please do
not try to build on an tmpfs filesystem.