postinst is in pekwm 0.1.17-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #!/bin/sh
set -e
# Automatically added by dh_installmenu
inst=/etc/menu-methods/pekwm
if [ -f $inst ]; then
	chmod a+x $inst
	if [ -x "`which update-menus 2>/dev/null`" ]; then
		update-menus
	fi
fi
# End automatically added section
# Automatically added by dh_installwm
if [ "$1" = "configure" ]; then
	update-alternatives --install /usr/bin/x-window-manager \
		x-window-manager /usr/bin/pekwm 20 \
		--slave /usr/share/man/man1/x-window-manager.1.gz \
		x-window-manager.1.gz /usr/share/man/man1/pekwm.1.gz
fi
# End automatically added section
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