Test sage 8.2 on macOS 10.11.6 instead
Test sage 8.2 on macOS 10.11.6 instead

If the sage-8.2-OSX_10.13.4 binary is used then sage is unable to find some header  (_stdio.h) when installing abelfunctions.

cswiercz/abelfunctions,cswiercz/abelfunctions,abelfunctions/abelfunctions,cswiercz/abelfunctions,abelfunctions/abelfunctions,abelfunctions/abelfunctions