brew install gqrx throws up error 'cant find gnu radio-audio development package'

[brucedavidson]

brew install godber/godber/gqrx
==> Installing gqrx from godber/godber
==> Downloading https://github.com/csete/gqrx/archive/v2.3.2.zip
Already downloaded: /Users/brucedavidson/Library/Caches/Homebrew/gqrx-2.3.2.zip
==> qmake PREFIX=/usr/local/Cellar/gqrx/2.3.2
Last 15 lines from /Users/brucedavidson/Library/Logs/Homebrew/gqrx/01.qmake:
2017-06-26 11:56:39 +0200

qmake
PREFIX=/usr/local/Cellar/gqrx/2.3.2

Info: creating stash file /private/tmp/gqrx-20170626-17600-gqmiye/gqrx-2.3.2/.qmake.stash
Project ERROR: gnuradio-audio development package not found

If reporting this issue please do so at (not Homebrew/brew or Homebrew/core):
https://github.com/godber/homebrew-godber/issues