+ gl_NEXT_HEADERS([string.h])
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use, and which is not
+ dnl guaranteed by C89.
+ gl_WARN_ON_USE_PREPARE([[#include <string.h>
+ ]],
+ [memmem mempcpy memrchr rawmemchr stpcpy stpncpy strchrnul strdup
+ strncat strndup strnlen strpbrk strsep strcasestr strtok_r strerror_r
+ strsignal strverscmp])