diff --git a/make/py-defs.mk b/make/py-defs.mk
index 5c884a62..a94a7edc 100644
--- a/make/py-defs.mk
+++ b/make/py-defs.mk
@@ -56,10 +56,24 @@ else
   PY_INSTALL_DIR_PYC        ?= $(PY_INSTALL_DIR_PY)
 endif
 
+PY_INSTALL                  ?= true
+PY_INSTALL_REG              ?= true
+ifneq ($(PY_INSTALL),true)
+  PY_INSTALL_REG             = false
+endif
+PY_INSTALL_PYC              ?= true
+ifneq ($(PY_INSTALL_REG),true)
+  PY_INSTALL_PYC             = false
+endif
+
 PY_INSTALL_DIRS             ?= $(sort $(PY_INSTALL_DIR_PY) $(PY_INSTALL_DIR_PYC))
 PY_INSTALLED_PY              = $(addprefix $(PY_INSTALL_DIR_PY)/,$(sort $(PY_ALL_PY)))
-PY_INSTALLED_PYC             = $(addprefix $(PY_INSTALL_DIR_PY)/,$(PY_PYC))
-PY_INSTALLED_REG             = $(PY_INSTALLED_PY) $(PY_INSTALLED_PYC)
+ifeq ($(PY_INSTALL_PYC),true)
+  PY_INSTALLED_PYC           = $(addprefix $(PY_INSTALL_DIR_PY)/,$(PY_PYC))
+endif
+ifeq ($(PY_INSTALL_REG),true)
+  PY_INSTALLED_REG           = $(PY_INSTALLED_PY) $(PY_INSTALLED_PYC)
+endif
 
 PYTHONPATH                  ?= $(call proj_query, pythonpath $(PROJECT) $(PY_PREREQ_RUN))
 #PYTHONPATH                  = $(subst $(space),,$(ENV_PYTHONPATH)$(foreach d,$(PY_MODULE_DIRS),:$(d)))