Makefile variables

Usage

Define a variable:

PYTHON_VERSION = "3.9.17"

Use variable in a recipe use ${foo} or $(foo) syntax:

install:
	pyenv install ${PYTHON_VERSION}
# or
install:
	pyenv install $(PYTHON_VERSION)

Substitute variable:

version:
	echo "Python version is ${PYTHON_VERSION}"

Example

PYTHON_VERSION = "3.9.17"
 
install:
	pyenv install ${PYTHON_VERSION} --skip-existing
	pyenv local ${PYTHON_VERSION}
	poetry env use ${PYTHON_VERSION}
	poetry install

How to read .env file in Makefile