--- a/config/rules.mk
+++ b/config/rules.mk
@@ -1545,19 +1545,16 @@ ifeq ($(XPIDL_MODULE),) # we need $(XPID
 export:: FORCE
 	@echo
 	@echo "*** Error processing XPIDLSRCS:"
 	@echo "Please define MODULE or XPIDL_MODULE when defining XPIDLSRCS,"
 	@echo "so we have a module name to use when creating MODULE.xpt."
 	@echo; sleep 2; false
 endif
 
-$(IDL_DIR)::
-	$(NSINSTALL) -D $@
-
 # generate .h files from into $(XPIDL_GEN_DIR), then export to $(DIST)/include;
 # warn against overriding existing .h file. 
 $(XPIDL_GEN_DIR)/.done:
 	$(MKDIR) -p $(XPIDL_GEN_DIR)
 	@$(TOUCH) $@
 
 # don't depend on $(XPIDL_GEN_DIR), because the modification date changes
 # with any addition to the directory, regenerating all .h files -> everything.
@@ -1618,24 +1615,18 @@ export:: $(XPIDLSRCS) $(IDL_DIR)
 export:: $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.h, $(XPIDLSRCS)) $(DIST)/include
 	$(INSTALL) $(IFLAGS1) $^ 
 endif # NO_DIST_INSTALL
 
 endif # XPIDLSRCS
 
 
 
-#
 # General rules for exporting idl files.
-#
-# WORK-AROUND ONLY, for mozilla/tools/module-deps/bootstrap.pl build.
-# Bug to fix idl dependency problems w/o this extra build pass is
-#   http://bugzilla.mozilla.org/show_bug.cgi?id=145777
-#
-$(IDL_DIR)::
+$(IDL_DIR):
 	$(NSINSTALL) -D $@
 
 export-idl:: $(SUBMAKEFILES) $(MAKE_DIRS)
 
 ifneq ($(XPIDLSRCS),)
 ifndef NO_DIST_INSTALL
 export-idl:: $(XPIDLSRCS) $(IDL_DIR)
 	$(INSTALL) $(IFLAGS1) $^

--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -1545,19 +1545,16 @@ ifeq ($(XPIDL_MODULE),) # we need $(XPID
 export:: FORCE
 	@echo
 	@echo "*** Error processing XPIDLSRCS:"
 	@echo "Please define MODULE or XPIDL_MODULE when defining XPIDLSRCS,"
 	@echo "so we have a module name to use when creating MODULE.xpt."
 	@echo; sleep 2; false
 endif
 
-$(IDL_DIR)::
-	$(NSINSTALL) -D $@
-
 # generate .h files from into $(XPIDL_GEN_DIR), then export to $(DIST)/include;
 # warn against overriding existing .h file. 
 $(XPIDL_GEN_DIR)/.done:
 	$(MKDIR) -p $(XPIDL_GEN_DIR)
 	@$(TOUCH) $@
 
 # don't depend on $(XPIDL_GEN_DIR), because the modification date changes
 # with any addition to the directory, regenerating all .h files -> everything.
@@ -1618,24 +1615,18 @@ export:: $(XPIDLSRCS) $(IDL_DIR)
 export:: $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.h, $(XPIDLSRCS)) $(DIST)/include
 	$(INSTALL) $(IFLAGS1) $^ 
 endif # NO_DIST_INSTALL
 
 endif # XPIDLSRCS
 
 
 
-#
 # General rules for exporting idl files.
-#
-# WORK-AROUND ONLY, for mozilla/tools/module-deps/bootstrap.pl build.
-# Bug to fix idl dependency problems w/o this extra build pass is
-#   http://bugzilla.mozilla.org/show_bug.cgi?id=145777
-#
-$(IDL_DIR)::
+$(IDL_DIR):
 	$(NSINSTALL) -D $@
 
 export-idl:: $(SUBMAKEFILES) $(MAKE_DIRS)
 
 ifneq ($(XPIDLSRCS),)
 ifndef NO_DIST_INSTALL
 export-idl:: $(XPIDLSRCS) $(IDL_DIR)
 	$(INSTALL) $(IFLAGS1) $^