--- old/make/autoconf/spec.gmk.in	2017-12-05 00:41:34.392164166 +0100
+++ new/make/autoconf/spec.gmk.in	2017-12-05 00:41:34.120154651 +0100
@@ -576,7 +576,7 @@
 INTERIM_LANGTOOLS_ARGS := \
     --limit-modules java.base,jdk.zipfs,$(INTERIM_LANGTOOLS_MODULES_COMMA) \
     --add-modules $(INTERIM_LANGTOOLS_MODULES_COMMA) \
-    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules \
     $(INTERIM_LANGTOOLS_ADD_EXPORTS) \
     #
 JAVAC_MAIN_CLASS = -m jdk.compiler.interim/com.sun.tools.javac.Main
@@ -587,8 +587,10 @@
 INTERIM_RMIC_ADD_EXPORTS := \
     --add-exports java.corba/com.sun.corba.se.impl.util=jdk.rmic.interim \
     #
-INTERIM_RMIC_ARGS := --limit-modules java.base,jdk.compiler,jdk.javadoc,java.corba \
-    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+# Use = to delay expansion of PathList since it's not available in this file.
+INTERIM_RMIC_ARGS = --limit-modules java.base,jdk.compiler,jdk.javadoc,java.corba \
+    --module-path $(call PathList, $(BUILDTOOLS_OUTPUTDIR)/interim_rmic_modules \
+        $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules) \
     $(INTERIM_RMIC_ADD_EXPORTS) \
     #