Merging pull request 2734

Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

* https://github.com/avocado-framework/avocado:
  Makefile: Make sure to use pip of the same version as python

Makefile.include

@@ -29,8 +29,8 @@ pip:
 	$(PYTHON) -m pip --version || $(PYTHON) -m ensurepip $(PYTHON_DEVELOP_ARGS) || $(PYTHON) -c "import os; import sys; import urllib; f = urllib.urlretrieve('https://bootstrap.pypa.io/get-pip.py')[0]; os.system('%s %s' % (sys.executable, f))"
 
 requirements: pip
-	- pip install "pip>=6.0.1"
-	- pip install -r requirements.txt
+	- $(PYTHON) -m pip install "pip>=6.0.1"
+	- $(PYTHON) -m pip install -r requirements.txt
 
 requirements-selftests: requirements
-	- pip install -r requirements-selftests.txt
+	- $(PYTHON) -m pip install -r requirements-selftests.txt