--- a/calendar/build.mk
+++ b/calendar/build.mk
@@ -69,8 +69,11 @@ endif # COMM_BUILD
 installer:
 	@$(MAKE) -C calendar/installer installer
 
 package:
 	@$(MAKE) -C calendar/installer
 
 package-compare:
 	@$(MAKE) -C calendar/installer package-compare
+
+source-package::
+	@$(MAKE) -C calendar/installer source-package

--- a/mail/build.mk
+++ b/mail/build.mk
@@ -87,8 +87,11 @@ installer:
 package:
 	@$(MAKE) -C mail/installer
 
 package-compare:
 	@$(MAKE) -C mail/installer package-compare
 
 install::
 	@$(MAKE) -C mail/installer install
+
+source-package::
+	@$(MAKE) -C mail/installer source-package

--- a/suite/build.mk
+++ b/suite/build.mk
@@ -85,16 +85,19 @@ package:
 	@$(MAKE) -C suite/installer
 
 package-compare:
 	@$(MAKE) -C suite/installer package-compare
 
 install::
 	@$(MAKE) -C suite/installer install
 
+source-package::
+	@$(MAKE) -C suite/installer source-package
+
 ifndef COMM_BUILD
 # mochitests need to be run from the Mozilla build system
 ifdef ENABLE_TESTS
 # Implemented in testing/testsuite-targets.mk
 mochitest-browser-chrome:
 	$(RUN_MOCHITEST) --browser-chrome
 	$(CHECK_TEST_ERROR)