diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 0c3265e7..bf345ce9 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -35,6 +35,12 @@ EXCLUDE_FROM_BUILD += \
 	dspfs \
 	jux3
 
+EXCLUDES_FILE ?= exclude.txt
+
+ifneq ($(wildcard $(EXCLUDES_FILE)),)
+	EXCLUDE_FROM_BUILD += $(shell cat $(EXCLUDES_FILE))
+endif
+
 BUILD_PROJECTS = $(filter-out $(EXCLUDE_FROM_BUILD),$(PROJECTS))
 
 ifeq ($(JANWARE_USER),)
@@ -77,6 +83,7 @@ RELEASE_SH            = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/build
 PKG_MANAGER_SH       ?= /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/pkg-manager.sh /opt/jw-build/bin/pkg-manager.sh) pkg-manager-not-found)
 CREATE_PROJECT_SH    ?= /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/jw-build-create-project.sh /opt/jw-build/bin/jw-build-create-project.sh) jw-build-create-project-not-found)
 LIST_VCS_FILES        = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/list-cvs-files.sh /opt/jw-build/bin/list-cvs-files.sh) list-cvs-files-not-found)
+JANWARE_PKG           = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/jannet /opt/jw-build/bin/jannet) jannet-not-found)
 BROWSER              ?= firefox
 GIT_SRV_ADMIN_SH      = JW_BUILD_SSH_EXTRA_OPTS="$(JW_BUILD_SSH_EXTRA_OPTS)" $(GIT_SSH) $(JANWARE_USER)@git.jannet.de /opt/jw-build/bin/git-srv-admin.sh 
 CVS_ADMIN_SH          = JW_BUILD_SSH_EXTRA_OPTS="$(JW_BUILD_SSH_EXTRA_OPTS)" $(GIT_SSH) $(JANWARE_USER)@git.jannet.de /opt/jw-build/bin/cvs-admin.sh 
@@ -111,6 +118,9 @@ pkg-install-prereq-build:
 pkg-install-prereq-release:
 	@make --no-print-directory echo-prereq-build echo-prereq-release 2>/dev/null | xargs -r $(PKG_MANAGER_SH) install -y
 
+pkg-exclude-built-today:
+	$(JANWARE_PKG) built-today > $(EXCLUDES_FILE)
+
 init-project-%:
 	$(CREATE_PROJECT_SH) $*