I've gotten in the habit lately of using SHELL and SHELLFLAGS (usually with ONESHELL) to just use a virtual environment for all the commands. You can't possibly

I've gotten in the habit lately of using SHELL and SHELLFLAGS (usually with ONESHELL) to just use a virtual environment for all the commands. You can't possibly forget to enter the virtualenv, and you also don't have to litter your makefile with extra variables. Does anyone else have other approaches beyond the two from the article?