fix build issue on Solaris 10.

CHANGES

@@ -1,4 +1,5 @@
 untagged yet (2016-05-10)
+    - fix: was not able to build on Solaris. Thanks to Mansoor Ali Khan.
     - feature: IOS XR mode now supports as-paths (ios-regexs). Thanks
       to Tassos Chatzithomaoglou for examples and proofreading.
     (additions from 2015-09-23)

config.h.in

@@ -30,6 +30,9 @@
 /* Define to 1 if you have the `strlcpy' function. */
 #undef HAVE_STRLCPY
 
+/* Define to 1 if you have the <sys/cdefs.h> header file. */
+#undef HAVE_SYS_CDEFS_H
+
 /* Define to 1 if you have the <sys/queue.h> header file. */
 #undef HAVE_SYS_QUEUE_H
 

configure

@@ -3398,7 +3398,7 @@ fi
 done
 
 
-for ac_header in sys/queue.h sys/tree.h
+for ac_header in sys/cdefs.h sys/queue.h sys/tree.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"

configure.in

@@ -3,7 +3,7 @@ AC_CONFIG_HEADER(config.h)
 AC_PROG_CC
 AC_PROG_INSTALL
 
-AC_CHECK_HEADERS([sys/queue.h sys/tree.h])
+AC_CHECK_HEADERS([sys/cdefs.h sys/queue.h sys/tree.h])
 
 AC_MSG_CHECKING([for STAILQ_ interface in queue.h])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([

sys_queue.h

@@ -33,7 +33,9 @@
 #ifndef _SYS_QUEUE_H_
 #define	_SYS_QUEUE_H_
 
+#if HAVE_SYS_CDEFS_H
 #include <sys/cdefs.h>
+#endif
 
 /*
  * This file defines four types of data structures: singly-linked lists,

sys_tree.h

@@ -30,7 +30,9 @@
 #ifndef	_SYS_TREE_H_
 #define	_SYS_TREE_H_
 
+#if HAVE_SYS_CDEFS_H
 #include <sys/cdefs.h>
+#endif
 
 /*
  * This file defines data structures for different types of trees: