Index: calendar/libical/configure.in
===================================================================
--- calendar/libical/configure.in	(revision 614)
+++ calendar/libical/configure.in	(working copy)
@@ -43,7 +43,10 @@
 
 if test "x$os_win32" = "xyes"; then
 	zoneinfo_dir="zoneinfo"
+else
+	zoneinfo_dir=""
 fi
+AC_SUBST(zoneinfo_dir)
 
 dnl *** bdb4 support
 
Index: calendar/libical/Makefile.am
===================================================================
--- calendar/libical/Makefile.am	(revision 614)
+++ calendar/libical/Makefile.am	(working copy)
@@ -1,3 +1,4 @@
+zoneinfo_dir = @zoneinfo_dir@
 
 EXTRA_DIST = \
 	ChangeLog \