gnuradio-wrapper is a simple derivation wrapping $(gnuradio)/bin/* to
make other blocks (from `extraPackages') available.
gnuradio-full uses gnuradio-wrapper to build gnuradio with blocks from
gnuradio-osmosdr (therefore allowing the use of rtl-sdr, hackrf, the
ccc-camp2015 badge, and similar).
Without this the examples don't work. Example:
$ /nix/store/HASH-gnuradio-3.7.1/share/gnuradio/examples/uhd/usrp_am_mw_rcv.py
Traceback (most recent call last):
File "/nix/store/HASH-gnuradio-3.7.1/share/gnuradio/examples/uhd/usrp_am_mw_rcv.py", line 24, in <module>
from gnuradio import gr, eng_notation
ImportError: No module named gnuradio
