What are the q/r/s/t tag suffixes? And building for FP4

Using /e/OS Build /e/OS
8

Are you planning to use docker ?

Proprietary files
Some proprietary files are needed to create a LineageOS build, but they’re not included in the LineageOS repo for legal reasons.
…
The third way is the easiest one and is enabled by default; if you’re OK with that just move on, otherwise set INCLUDE_PROPRIETARY (true) to false and manually provide the blobs (not explained in this guide).

… “is enabled by default” – so no blobs to extract.

Alternatively if you are using a manual method it is good to know that proprietary_vendor_fairphone_FP4 exists