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-rw-r--r--posix/getopt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/posix/getopt.c b/posix/getopt.c
index 0da5965137..4e11744db8 100644
--- a/posix/getopt.c
+++ b/posix/getopt.c
@@ -61,6 +61,7 @@ Cambridge, MA 02139, USA.  */
 /* Don't include stdlib.h for non-GNU C libraries because some of them
    contain conflicting prototypes for getopt.  */
 #include <stdlib.h>
+#include <unistd.h>
 #endif	/* GNU C library.  */
 
 #ifndef _