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--- a/src/utils/utmkdefs.mk
+++ b/src/utils/utmkdefs.mk
@@ -1,4 +1,4 @@
-ALL_CXXFLAGS = \
+ALL_CXXFLAGS = -std=c++11 \
     -I../aspell \
     -I../bincimapmime \
     -I../common \