Because we assume a freestanding C89 compiler, Gnulib code can include
@code{<float.h>}, @code{<limits.h>}, @code{<stdarg.h>}, and
@code{<stddef.h>} unconditionally. It can also assume the existence
-of @code{<ctime.h>}, @code{<errno.h>}, @code{<fcntl.h>},
+of @code{<ctype.h>}, @code{<errno.h>}, @code{<fcntl.h>},
@code{<locale.h>}, @code{<signal.h>}, @code{<stdio.h>},
@code{<stdlib.h>}, @code{<string.h>}, and @code{<time.h>}. Similarly,
many modules include @code{<sys/types.h>} even though it's not even in