diff --git a/.gitignore b/.gitignore
index adc49382e..eb75b72bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 /liblcf-*/
 /tests/*.log
 /tests/*.trs
+/time_stamp*
 .deps/
 .libs/
 .dirstamp
diff --git a/Makefile.am b/Makefile.am
index b5281ede7..56b2b80fc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -199,6 +199,7 @@ time_stamp_CPPFLAGS = \
 	-I$(srcdir)/src \
 	-I$(srcdir)/src/generated
 time_stamp_CXXFLAGS = \
+	-std=c++11 \
 	$(EXPAT_CXXFLAGS) \
 	$(ICU_CXXFLAGS)
 time_stamp_LDADD = \