Text mode IDE can not find unit System on a fresh Ubuntu install

Text mode IDE can not find unit System if trying to compile simple "Hello, world!" app on a fresh Ubuntu install.

User should manually add

 -Fu/usr/lib/x86_64-linux-gnu/fpc/$fpcversion/units/$fpctarget
 -Fu/usr/lib/x86_64-linux-gnu/fpc/$fpcversion/units/$fpctarget/*
 -Fu/usr/lib/x86_64-linux-gnu/fpc/$fpcversion/units/$fpctarget/rtl

to fp.cfg in the project folder to fix it, but it's quite counterintuitive.

Suggestion: on Linux, text mode IDE should get unit paths from /etc/fpc.cfg by default if fp.cfg does not exist in the current folder.