diff --git a/include/libc/libc_fdset.h b/include/libc/libc_fdset.h
index 386c0402067bb61bd11490248a2868244faf4247..057cc7fed293ee4bc0588ad3a7f82cc17427675a 100644
--- a/include/libc/libc_fdset.h
+++ b/include/libc/libc_fdset.h
@@ -29,6 +29,10 @@
 
 #if defined(RT_USING_NEWLIB) || defined(_WIN32)
 #include <sys/types.h>
+#if defined(HAVE_SYS_SELECT_H)
+#include <sys/select.h>
+#endif
+
 #else
 
 #ifdef RT_USING_DFS_NET
@@ -40,32 +44,31 @@
 #define FD_SETSIZE      DFS_FD_MAX
 #endif
 
-#  ifndef	FD_SETSIZE
-#	define	FD_SETSIZE	32
+#  ifndef   FD_SETSIZE
+#   define  FD_SETSIZE  32
 #  endif
 
-#  define	NBBY	8		/* number of bits in a byte */
+#  define   NBBY    8       /* number of bits in a byte */
 
-typedef	long	fd_mask;
-#  define	NFDBITS	(sizeof (fd_mask) * NBBY)	/* bits per mask */
-#  ifndef	howmany
-#	define	howmany(x,y)	(((x)+((y)-1))/(y))
+typedef long    fd_mask;
+#  define   NFDBITS (sizeof (fd_mask) * NBBY)   /* bits per mask */
+#  ifndef   howmany
+#   define  howmany(x,y)    (((x)+((y)-1))/(y))
 #  endif
 
 /* We use a macro for fd_set so that including Sockets.h afterwards
    can work.  */
-typedef	struct _types_fd_set {
-	fd_mask	fds_bits[howmany(FD_SETSIZE, NFDBITS)];
+typedef struct _types_fd_set {
+    fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
 } _types_fd_set;
 
 #define fd_set _types_fd_set
 
-#  define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))
-#  define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))
-#  define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))
+#  define   FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))
+#  define   FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))
+#  define   FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))
 #  define   FD_ZERO(p)      memset((void*)(p), 0, sizeof(*(p)))
 
 #endif
 
 #endif
-