diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 6e1fc851..b9f8b2c1 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -42,6 +42,8 @@ EXCLUDE_FROM_BUILD = \
 	feedfs-qt \
 	jux3
 
+BUILD_PROJECTS = $(filter-out $(EXCLUDE_FROM_BUILD),$(PROJECTS))
+
 ifeq ($(JANWARE_USER),)
   export JANWARE_USER = $(shell id -un)
 endif
@@ -60,21 +62,26 @@ endif
 
 # ------------ commands
 
-PGIT       = CLONE_PROJECTS="$(PROJECTS)" /bin/bash $(firstword $(wildcard ./ytools/devutil/scripts/pgit.sh /opt/ytools/bin/pgit.sh) pgit.sh-not-found)
-BUILD_PY   = python ./ytools/devutil/scripts/build.py -b $(shell pwd) $(BUILD_PY_EXTRA_ARGS)
-PURGE_SH   = /bin/bash $(firstword $(wildcard ./ytools/devutil/scripts/purge-stale-projects.sh /opt/ytools/bin/purge-stale-projects.sh) purge-not-found)
-RELEASE_SH = /bin/bash $(firstword $(wildcard ./ytools/devutil/scripts/build-release.sh /opt/ytools/bin/build-release.sh) release-not-found)
-BROWSER   ?= firefox
+MOD_SCRIPT_DIR = ./ytools/devutil/scripts
+PGIT           = CLONE_PROJECTS="$(PROJECTS)" /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/pgit.sh /opt/ytools/bin/pgit.sh) pgit.sh-not-found)
+BUILD_PY       = python $(MOD_SCRIPT_DIR)/build.py -b $(shell pwd) $(BUILD_PY_EXTRA_ARGS)
+PURGE_SH       = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/purge-stale-projects.sh /opt/ytools/bin/purge-stale-projects.sh) purge-not-found)
+RELEASE_SH     = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/build-release.sh /opt/ytools/bin/build-release.sh) release-not-found)
+BROWSER       ?= firefox
 
 # ------------ targets
   
 all: pull.done
 
 all clean: pull.done
-	$(BUILD_PY) $@ $(filter-out $(EXCLUDE_FROM_BUILD),$(PROJECTS))
+	$(BUILD_PY) $@ $(BUILD_PROJECTS)
 
 pkg-%: pull.done
-	$(BUILD_PY) $@ $(filter-out $(EXCLUDE_FROM_BUILD),$(PROJECTS))
+	$(BUILD_PY) $@ $(BUILD_PROJECTS)
+
+echo-required-pkg:
+	@make pull.done >/dev/null 2>&1
+	@python $(MOD_SCRIPT_DIR)/projects.py required-pkg $(BUILD_PROJECTS)
 
 clean: done.clean