patch provided by pancake at phreaker.net in PR 26777
changes (from Debian changelog):
posh (0.3.9) unstable; urgency=medium
* trap builtin now errors when no signals are specified.
closes: #265103.
* Move trap-related regression tests to their own file,
and add one to check for error on "trap 0".
posh (0.3.8) unstable; urgency=high
* Fix tilde expansion thinko introduced in 0.3.4.
posh (0.3.7) unstable; urgency=low
* Remove some cruft left around from ksh functions.
posh (0.3.6) unstable; urgency=low
* Add a better regression test for umask.
* Drop support of ksh88 ":[#%]+"-type trimming.
* Adjust regression tests to make sure ${blah:#blah} gives
an error.
posh (0.3.5) unstable; urgency=low
* Clean unused variables left after 0.3.4.
* Add prebuild target to debian/rules.
* Drop qsort altogether.
posh (0.3.4) unstable; urgency=low
* Fix most of the signedness comparison warnings.
* Remove homedir caching code.
* Switch specials, keywords, aliases, builtins, vars, and funs hashes
to use libc tsearch() and friends.
* Remove old table hash routines.
posh (0.3.3) unstable; urgency=low
* Rename custom table functions to prevent conflicts with
b-tree functions when search.h is included.
* Remove vestigial tracked alias code.
posh (0.3.2) unstable; urgency=low
* Make getn() use strtol().
* Mark unused function parameters to avoid gcc warnings.
posh (0.3.1) unstable; urgency=low
* Use libc's instead of internal qsort.
* Add -W to CFLAGS.
