Check if X/Open network library is required

ares/configure.ac

@@ -191,6 +191,28 @@ dnl **********************************************************************
 dnl Checks for libraries.
 dnl **********************************************************************
 
+tst_lib_xnet_required="no"
+AC_MSG_CHECKING([if X/Open network library is required])
+CURL_CHECK_DEF([__hpux], [], [silent])
+CURL_CHECK_DEF([_XOPEN_SOURCE_EXTENDED], [], [silent])
+if test "$curl_cv_have_def__XOPEN_SOURCE_EXTENDED" = "yes" &&
+  test "$curl_cv_have_def___hpux" = "yes"; then
+  my_ac_save_LIBS=$LIBS
+  LIBS="-lxnet $LIBS"
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+      if(0 != getpeername(0, 0, 0))
+        return 1;
+    ]])
+  ],[
+    tst_lib_xnet_required="yes"
+  ],[
+    LIBS=$my_ac_save_LIBS
+  ])
+fi
+AC_MSG_RESULT([$tst_lib_xnet_required])
+
 dnl gethostbyname without lib or in the nsl lib?
 AC_CHECK_FUNC(gethostbyname,
               [HAVE_GETHOSTBYNAME="1"

configure.ac

@@ -498,6 +498,28 @@ dnl **********************************************************************
 dnl Checks for libraries.
 dnl **********************************************************************
 
+tst_lib_xnet_required="no"
+AC_MSG_CHECKING([if X/Open network library is required])
+CURL_CHECK_DEF([__hpux], [], [silent])
+CURL_CHECK_DEF([_XOPEN_SOURCE_EXTENDED], [], [silent])
+if test "$curl_cv_have_def__XOPEN_SOURCE_EXTENDED" = "yes" &&
+  test "$curl_cv_have_def___hpux" = "yes"; then
+  my_ac_save_LIBS=$LIBS
+  LIBS="-lxnet $LIBS"
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+      if(0 != getpeername(0, 0, 0))
+        return 1;
+    ]])
+  ],[
+    tst_lib_xnet_required="yes"
+  ],[
+    LIBS=$my_ac_save_LIBS
+  ])
+fi
+AC_MSG_RESULT([$tst_lib_xnet_required])
+
 dnl gethostbyname without lib or in the nsl lib?
 AC_CHECK_FUNC(gethostbyname,
               [HAVE_GETHOSTBYNAME="1"