diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index b1f1ffbd..e0db55af 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -141,6 +141,7 @@ PURGE_SH                     = /bin/bash $(firstword $(wildcard $(JWB_SCRIPT_DIR
 CREATE_PROJECT_SH           ?= /bin/bash $(firstword $(wildcard $(JWB_SCRIPT_DIR)/jw-pkg-create-project.sh $(JW_PKG_BINDIR)/jw-pkg-create-project.sh) jw-pkg-create-project-not-found)
 LIST_VCS_FILES_SH            = /bin/bash $(firstword $(wildcard $(JWB_SCRIPT_DIR)/scm.sh $(JW_PKG_BINDIR)/scm.sh) scm-sh-not-found) ls-files
 GIT_SRV_ADMIN_SH             = JW_PKG_SSH_EXTRA_OPTS="$(JW_PKG_SSH_EXTRA_OPTS)" $(GIT_SSH) $(JANWARE_USER)@git.janware.com $(JW_PKG_REMOTE_BINDIR)/git-srv-admin.sh
+JANWARE_PACKAGE_FILTER       = url =~ janware
 
 # ------------ projects to be built
 
@@ -237,6 +238,9 @@ cloc:
 
 # --- package-related targets
 
+pkg-delete-ours:
+	$(PKG_MANAGER) select "$(JANWARE_PACKAGE_FILTER)" | xargs -r $(PKG_MANAGER) delete
+
 pkg-manager-refresh:
 	$(PKG_MANAGER) refresh