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-rw-r--r--include/sys/select.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sys/select.h b/include/sys/select.h
index c5a2877f..e25257d2 100644
--- a/include/sys/select.h
+++ b/include/sys/select.h
@@ -32,6 +32,9 @@ typedef struct
int select (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, struct timeval *__restrict);
int pselect (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, const struct timespec *__restrict, const sigset_t *__restrict);
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define NFDBITS (8*(int)sizeof(long))
+#endif
#ifdef __cplusplus
}