dnl defines uid_t and gid_t if not already defined
AC_TYPE_UID_T
+dnl sets HAVE_SSIZE_T if ssize_t is defined
+AC_CHECK_TYPES(ssize_t)
+
dnl check what exactly size_t is on this machine - this is necessary to avoid
dnl ambiguous overloads in several places, notably wx/string.h and wx/array.h
AC_LANG_SAVE