On master (8e0f341779e1d2754432765ec09deb7488f5b093):
0$ make -C depends qt HOST=x86_64-apple-darwin16
1make: Entering directory '/home/hebasto/guix/GitHub/bitcoin/depends'
2Fetching zlib-1.2.11.tar.gz from https://www.zlib.net
3 % Total % Received % Xferd Average Speed Time Time Time Current
4 Dload Upload Total Spent Left Speed
5100 593k 100 593k 0 0 411k 0 0:00:01 0:00:01 --:--:-- 411k
6/home/hebasto/guix/GitHub/bitcoin/depends/work/download/zlib-1.2.11/zlib-1.2.11.tar.gz.temp: OK
7Extracting zlib...
8/home/hebasto/guix/GitHub/bitcoin/depends/sources/zlib-1.2.11.tar.gz: OK
9Preprocessing zlib...
10Configuring zlib...
11tar: /home/hebasto/guix/GitHub/bitcoin/depends/built/x86_64-apple-darwin16/native_cctools/native_cctools-55562e4073dea0fbfd0b20e0bf69ffe6390c7f97-ee52008b72b.tar.gz: Cannot open: No such file or directory
12tar: Error is not recoverable: exiting now
13make: *** [funcs.mk:261: /home/hebasto/guix/GitHub/bitcoin/depends/work/build/x86_64-apple-darwin16/zlib/1.2.11-56aa350339c/./.stamp_configured] Error 2
14make: Leaving directory '/home/hebasto/guix/GitHub/bitcoin/depends