Makefile: suppress displaying commands for git_version.py
Makefile: suppress displaying commands for git_version.py

"@" before that command suppresses echoing.

wking/swc-amy,shapiromatron/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,wking/swc-amy,swcarpentry/amy,swcarpentry/amy,vahtras/amy,wking/swc-amy,pbanaszkiewicz/amy,vahtras/amy,vahtras/amy,shapiromatron/amy,shapiromatron/amy,wking/swc-amy,swcarpentry/amy