["python","makefile","virtualenv"]
How to use virtualenv in makefile

I want to perform several operations while working on a specified virtualenv. For example command make install would be equivalent to source path/to/virtualenv/bin/activate pip install -r requirements.txt Is it possible?
In make you can run a shell as command. In this shell you can do everything you can do in a shell you started from comandline. Example: install: ( \ source path/to/virtualenv/bin/activate; \ pip install -r requirements.txt; \ ) Attention must be paid to the ;and the \. Everything between the open and close brace will be done in a single instance of a shell.