diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 578710bc..06657b6d 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -93,6 +93,7 @@ PKG_MANAGER_SH       ?= /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/pkg-m
 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)
+GET_OS_SH             = /bin/bash $(firstword $(wildcard $(MOD_SCRIPT_DIR)/get-os.sh /opt/jw-build/bin/get-os.sh) get-os-sh-not-found)
 BROWSER              ?= firefox
 GIT_SRV_ADMIN_SH      = JW_BUILD_SSH_EXTRA_OPTS="$(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) $(JANWARE_USER)@git.jannet.de /opt/jw-build/bin/cvs-admin.sh 
@@ -125,6 +126,9 @@ echo-prereq-build:
 echo-prereq-release:
 	@$(PROJECTS_PY) requires-pkg --flavours "build run release" $(BUILD_PROJECTS)
 
+echo-os:
+	@$(GET_OS_SH)
+
 pkg-manager-refresh:
 	$(PKG_MANAGER_SH) refresh -y