diff -Nrup a/Makefile b/Makefile
--- a/Makefile	2018-10-04 14:49:24.000000000 -0400
+++ b/Makefile	2018-10-18 16:23:33.675393451 -0400
@@ -343,7 +343,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fn
 # January's first Monday when a "%V" format is used and January 1
 # falls on a Friday, Saturday, or Sunday.
 
-CFLAGS=
+CFLAGS= -DHAVE_SNPRINTF=1
 
 # Linker flags.  Default to $(LFLAGS) for backwards compatibility
 # to release 2012h and earlier.
Binary files a/tzdata2018f-rearguard.tar.gz and b/tzdata2018f-rearguard.tar.gz differ