Closed issue by xtraeme on void-packages repository

https://github.com/void-linux/void-packages/issues/21089

Description:
If any of you have noticed why linux5* builds are so slow with musl currently it's due to GNU make when it was downgraded to 4.2.

This version contains an obsolete glob implementation that is used by default with musl (see configure) that makes building linux5* with -jX not parallelize jobs as it should.

Try with current void make (4.2.x) `./xbps-src -jX linux5.6` and then compare with make 4.3.

Fix: update GNU glob implementation for 4.2 or update again to 4.3.

Your choice! I don't really care because I've fixed this on my tree...