diff --git a/Makefile b/Makefile
index 7bf6b73..8084d82 100644
--- a/Makefile
+++ b/Makefile
@@ -70,6 +70,9 @@
 DEB_DEPENDS += libboost-all-dev libffi-dev python3-ply libmbedtls-dev
 DEB_DEPENDS += cmake ninja-build uuid-dev python3-jsonschema python3-yaml yamllint
 DEB_DEPENDS += python3-venv  # ensurepip
+DEB_DEPENDS += python3-dev   # needed for python3 -m pip install psutil
+# python3.6 on 16.04 requires python36-dev
+ 
 ifeq ($(OS_VERSION_ID),14.04)
 	DEB_DEPENDS += libssl-dev
 else ifeq ($(OS_ID)-$(OS_VERSION_ID),debian-8)
@@ -91,12 +94,13 @@
 RPM_DEPENDS += libuuid-devel
 RPM_DEPENDS += mbedtls-devel
 RPM_DEPENDS += yamllint
+RPM_DEPENDS += python3-devel  # needed for python3 -m pip install psutil
 
 ifeq ($(OS_ID),fedora)
 	RPM_DEPENDS += dnf-utils
 	RPM_DEPENDS += subunit subunit-devel
 	RPM_DEPENDS += compat-openssl10-devel
-	RPM_DEPENDS += python3-devel python3-ply
+	RPM_DEPENDS += python3-ply  # for vppapigen
 	RPM_DEPENDS += python3-virtualenv python3-jsonschema
 	RPM_DEPENDS += cmake
 	RPM_DEPENDS_GROUPS = 'C Development Tools and Libraries'
@@ -110,7 +114,7 @@
 else
 	RPM_DEPENDS += yum-utils
 	RPM_DEPENDS += openssl-devel
-	RPM_DEPENDS += python-devel python36-ply
+	RPM_DEPENDS += python36-ply  # for vppapigen
 	RPM_DEPENDS += python3-devel python3-pip
 	RPM_DEPENDS += python-virtualenv python36-jsonschema
 	RPM_DEPENDS += devtoolset-7