You are talking of runtime code only. Here are instructions how to
create a Lazarus runtime package (I never created an FPC package...): Go
to "Package" > "New package", specify name and location of the new
package, an empty package will be created automatically. In the package
editor which opens right-click on "Files" and add all the files which
are supposed to be contained in the package. When the units that you
need depend on other units found in other packages you must add these
other packages to the node "Required Packages" (right-click, "Add").
Then click "Compile". When everything is correct, go to "options" in the
package editor, and in "IDE Integration" select "Runtime package". This
means that the package is not installed into the IDE. Save, of course.
In order to use this runtime package in a project, open the Project
Inspector, right-click on "Required Packages" and select your new
package to be added to the project tree. Now you can "use" all units of
this package.
When you are on a new Lazarus installation the IDE does not yet know
your package. Go to "Package" > "Open Package File (*.lpk)". That's all
to be done so that the IDE knows the path to the package. When you
compile your project the package will be compiled as well. Of course you
can click "Compile" also in the Package Editor to make sure that your
package is correct in the new installation. There is no need to click
"Use" > "Install" for a runtime package.
Coming from Delphi you may be tempted to extend the unit path by the
path to your package units. Do not do this - you will have lots of
trouble. The Lazarus package concept does not require you to set any paths.
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