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-rw-r--r--libio/filedoalloc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c
index 0ebb75d9c5..f71656478c 100644
--- a/libio/filedoalloc.c
+++ b/libio/filedoalloc.c
@@ -41,13 +41,18 @@ the executable file might be covered by the GNU General Public License. */
 
 /* Modified for GNU iostream by Per Bothner 1991, 1992. */
 
-#define _POSIX_SOURCE
+#ifndef _POSIX_SOURCE
+# define _POSIX_SOURCE
+#endif
 #include "libioP.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef __STDC__
 #include <stdlib.h>
 #endif
+#ifdef _LIBC
+# include <unistd.h>
+#endif
 
 /*
  * Allocate a file buffer, or switch to unbuffered I/O.