+ 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>
+ ]],
+ [ffsl ffsll memmem mempcpy memrchr rawmemchr stpcpy stpncpy strchrnul
+ strdup strncat strndup strnlen strpbrk strsep strcasestr strtok_r
+ strerror_r strsignal strverscmp])