diff --git a/make/defs.mk b/make/defs.mk
index a54d3fb4..c3b33f1e 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -79,6 +79,22 @@ ifndef PRINTF
   PRINTF                    := $(shell $(WHICH) printf)
 endif
 
+ifndef MINIMAL_MAKEFLAGS
+  MINIMAL_MAKEFLAGS         :=
+endif
+ifndef MINIMAL_PATH
+  MINIMAL_PATH              := /usr/sbin:/usr/bin:/sbin:/bin
+endif
+ifndef MINIMAL_LD_LIBRARY_PATH
+  MINIMAL_LD_LIBRARY_PATH   :=
+endif
+ifndef MINIMAL_UMASK
+  MINIMAL_UMASK             := 0002
+endif
+ifndef PRISTINE_MAKE
+  PRISTINE_MAKE             := umask $(MINIMAL_UMASK) && MAKEFLAGS=$(MINIMAL_MAKEFLAGS) LD_LIBRARY_PATH=$(MINIMAL_LD_LIBRARY_PATH) PATH=$(MINIMAL_PATH) $(MAKE)
+endif
+
 PKG_SH_EXE                  := /bin/bash $(JWB_SCRIPT_DIR)/pkg.sh
 LOG_INSTALL_SH              := $(PKG_SH_EXE) log-install
 UPDATE_REPO_SH              := /opt/packager-server/bin/packager-server schedule-rebuild