diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 58fc0088..8ddd802a 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -104,19 +104,19 @@ clean-dirs:
 	ls */dirs-started-all.done 2>/dev/null | sed 's%/.*%%' | xargs -r $(BUILD_PY) clean
 
 echo-prereq-build:
-	@$(PROJECTS_PY) required-pkg $(BUILD_PROJECTS)
+	@$(PROJECTS_PY) required-pkg --flavours "build" $(BUILD_PROJECTS)
 
 echo-prereq-release:
-	@$(PROJECTS_PY) required-pkg --flavour release $(BUILD_PROJECTS)
+	@$(PROJECTS_PY) required-pkg --flavours "build run release" $(BUILD_PROJECTS)
 
 pkg-manager-refresh:
 	$(PKG_MANAGER_SH) refresh
 
 pkg-install-prereq-build:
-	@make --no-print-directory echo-prereq-build 2>/dev/null | xargs -r $(PKG_MANAGER_SH) install -y
+	@$(PROJECTS_PY) required-pkg --flavours "build" $(BUILD_PROJECTS) | xargs -r $(PKG_MANAGER_SH) install -y
 
 pkg-install-prereq-release:
-	@make --no-print-directory echo-prereq-build echo-prereq-release 2>/dev/null | xargs -r $(PKG_MANAGER_SH) install -y
+	@$(PROJECTS_PY) required-pkg --flavours "build run release" $(BUILD_PROJECTS) | xargs -r $(PKG_MANAGER_SH) install -y
 
 pkg-exclude-built-today:
 	$(JANWARE_PKG) built-today > $(EXCLUDES_FILE)