used AC_USE_SYSTEM_EXTENTIONS() in configure.ac

lib/hio-cfg.h.in

@@ -880,6 +880,28 @@
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
+/* Enable extensions on AIX 3, Interix.  */
+#ifndef _ALL_SOURCE
+# undef _ALL_SOURCE
+#endif
+/* Enable GNU extensions on systems that have them.  */
+#ifndef _GNU_SOURCE
+# undef _GNU_SOURCE
+#endif
+/* Enable threading extensions on Solaris.  */
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif
+/* Enable extensions on HP NonStop.  */
+#ifndef _TANDEM_SOURCE
+# undef _TANDEM_SOURCE
+#endif
+/* Enable general extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+
+
 /* Version number of package */
 #undef VERSION
 
@@ -905,3 +927,13 @@
 
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
+
+/* Define to 1 if on MINIX. */
+#undef _MINIX
+
+/* Define to 2 if the system does not provide POSIX.1 features except with
+   this defined. */
+#undef _POSIX_1_SOURCE
+
+/* Define to 1 if you need to in order for `stat' and other things to work. */
+#undef _POSIX_SOURCE

lib/pty.c

@@ -25,15 +25,15 @@
 #include <hio-pty.h>
 #include "hio-prv.h"
 
+#include <stdlib.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sys/wait.h>
 #include <sys/uio.h>
 #include <sys/ioctl.h>
-#include <stdlib.h>
-#include <fcntl.h>
 #include <signal.h>
-#include <stdlib.h>
+
 
 #if defined(HAVE_PTY_H)
 #	include <pty.h>