$ vim ~/.bash_profile
add
complete -W "\`grep -oE '^[a-zA-Z0-9_.-]+:([^=]|$)' Makefile | sed 's/[^a-zA-Z0-9_.-]*$//'\`" make
https://stackoverflow.com/questions/4188324/bash-completion-of-makefile-target/38415982#38415982
$ vim ~/.bash_profile
add
complete -W "\`grep -oE '^[a-zA-Z0-9_.-]+:([^=]|$)' Makefile | sed 's/[^a-zA-Z0-9_.-]*$//'\`" make
https://stackoverflow.com/questions/4188324/bash-completion-of-makefile-target/38415982#38415982