diff --git a/lib/py/Makefile.am b/lib/py/Makefile.am
index 5183b9c..a075eb1 100755
--- a/lib/py/Makefile.am
+++ b/lib/py/Makefile.am
@@ -21,6 +21,7 @@
 
 if WITH_PY3
 py3-build:
+	$(PIP3) install -r requirements.txt || $(PIP3) install --user -r requirements.txt
 	$(PYTHON3) setup.py build
 py3-test: py3-build
 	$(PYTHON3) test/thrift_json.py
@@ -31,6 +32,7 @@
 endif
 
 all-local: py3-build
+	$(PIP) install -r requirements.txt || $(PIP) install --user -r requirements.txt
 	$(PYTHON) setup.py build
 
 # We're ignoring prefix here because site-packages seems to be
@@ -38,6 +40,7 @@
 # Old version (can't put inline because it's not portable).
 #$(PYTHON) setup.py install --prefix=$(prefix) --root=$(DESTDIR) $(PYTHON_SETUPUTIL_ARGS)
 install-exec-hook:
+	$(PIP) install -r requirements.txt
 	$(PYTHON) setup.py install --root=$(DESTDIR) --prefix=$(PY_PREFIX) $(PYTHON_SETUPUTIL_ARGS)
 
 clean-local: