Load the package
----------------
Package -> Open Package File (lpk) ... (open zipfilepkg.lpk)
Add a new dependency for the package
------------------------------------
Add other items (main screen option for the concerned package) [1]
-> New Requirement -> Package Name
-> select "LazUtils" in the combobox or enter it manually,
-> Create New Requirement
You should now see LazUtils in the "Required Packages" section (main screen option for the concerned package), just before FCL (>=1.0) [2]
Save modified package
---------------------
Save (main screen option for the concerned package) [3]
Your zipfilepkg.lpk file has now been updated, and you can also compile it.
You can also just edit the zipfilepkg.lpk file itself with a "correct" text editor (if you know what you are doing).
Modify the RequiredPkgs section:
<RequiredPkgs Count="2">
<Item1>
<PackageName Value="LazUtils"/>
</Item1>
<Item2>
<PackageName Value="FCL"/>
<MinVersion Major="1" Valid="True"/>
</Item2>