@file{sys/time.h} includes @file{time.h}, but @file{time.h} is not
protected against multiple inclusion, so programs should not explicitly
include both files. This macro is useful in programs that use, for
-example, @code{struct timeval} or @code{struct timezone} as well as
+example, @code{struct timeval} as well as
@code{struct tm}. It is best used in conjunction with
@code{HAVE_SYS_TIME_H}, which can be checked for using
@code{AC_CHECK_HEADERS(sys/time.h)}.