tazpkg doesn't do much for package dependancies, for example when you uninstall a package, you might be able to uninstall a few others as well. Wanting to explore this a bit I wrote a script. Unfortunately I don't know the markup for this site, and the indenting has gotten lost. Good luck & let me know what you think.

#!/bin/sh
# tazdeps
# 0. read the receipts in the dir given on the cmdline
# 1. for each pkg record the DEPENDS:
# 2. for each pkg record the pkgs that depend on it
# 3. for each pkg that none others require display those it alone
# requires and which could thus be uninstalled if pkg was uninstalled
# 4. for each pkg required by at least two pkgs, list which ones
# 5. cleanup the tempfiles used

# 0. Parse arguments and general preparation
if [ "$1" = "" ]; then
dirname="/var/lib/tazpkg/installed"
else
dirname=`echo $1 | sed 's!/$!!'`
fi

echo "Reading receipts from $dirname"

depslist=`mktemp`
tempdir=`mktemp -d`
pkglist=`ls $dirname`
manyreq="" # List of pkgs that many others require for step n°4
unset IFS

# 1. Read the receipts and record the depends in a tempfile
DEPENDS=""
for pkg in $pkglist; do
. $dirname/$pkg/receipt
echo "$pkg: " $DEPENDS >> $depslist
# NB $DEPENDS is outside the quotes so that if it includes
# newlines e.g. as for xorg, these get replaced by spaces.
DEPENDS=""
done

# 2. For each pkg record the pkgs that require it
IFS="
"
for entry in `cat $depslist`; do
pkg=`echo $entry | cut -d":" -f1`
deps=`echo $entry | cut -d":" -f2`
unset IFS
for dep in $deps; do
echo $pkg >> $tempdir/$dep
done
done

echo "===================================================================="
echo " For each package that none others require, those it alone requires "
echo "===================================================================="

# 3. For each pkg that none others require display those it alone
# requires.
# Could be done recursively, e.g. python alone requires tk, but also
# tcl is only required by python and tk. So if we uninstall python and
# we don't care to keep tk, we could uninstall tcl as well.
IFS="
"
for entry in `cat $depslist`; do
pkg=`echo $entry | cut -d":" -f1`
deps=`echo $entry | cut -d":" -f2`
if [ ! -e $tempdir/$pkg ]; then
echo -n "$pkg :"
unset IFS
for dep in $deps; do
if [ -f $tempdir/$dep \
-a `cat $tempdir/$dep | wc -l` -eq 1 ]; then
echo -n " $dep"
fi
done
echo
elif [ `cat $tempdir/$pkg | wc -l` -gt 1 ]; then
manyreq="$manyreq $pkg"
fi
done

echo "=================================================="
echo " Packages required by at least two other packages "
echo "=================================================="

# 4. for each pkg required by at least two pkgs, list which ones
for pkg in $manyreq; do
echo -n "$pkg : "
cat $tempdir/$pkg | tr "\n" " "
echo
done

# 5. Cleanups
rm $depslist
rm -rf $tempdir