diff --git a/lib/erl/Makefile.am b/lib/erl/Makefile.am
index 92e2204..20aadeb 100644
--- a/lib/erl/Makefile.am
+++ b/lib/erl/Makefile.am
@@ -18,7 +18,9 @@
 #
 
 THRIFT = ../../compiler/cpp/thrift
+THRIFT_OMIT_FILE = test/Thrift_omit_without.thrift
 THRIFT_FILES = $(wildcard test/*.thrift) \
+		  $(THRIFT_OMIT_FILE) \
 		  ../../test/ConstantsDemo.thrift \
 		  ../../test/NameConflictTest.thrift \
 		  ../../test/ThriftTest.thrift
@@ -33,6 +35,10 @@
 ERL_FLAG_LEGACY = erl:legacynames
 ERL_FLAG_MAPS = erl:maps
 endif
+
+$(THRIFT_OMIT_FILE): test/Thrift_omit_with.thrift
+	grep -v omit $< >$@
+
 .generated: $(THRIFT) $(THRIFT_FILES)
 	for f in $(THRIFT_FILES) ; do \
 		$(THRIFT) --gen $(ERL_FLAG) -o test $$f ; \
@@ -65,6 +71,7 @@
 clean:
 	rm -f .generated
 	rm -rf test/gen-erl/
+	rm -f $(THRIFT_OMIT_FILE)
 	$(REBAR) clean
 
 maintainer-clean-local: