diff --git a/Lib/test/test_curses.py b/Lib/test/test_curses.py
index 785a31c..514ed83 100644
--- a/Lib/test/test_curses.py
+++ b/Lib/test/test_curses.py
@@ -143,6 +143,7 @@
         stdscr.idlok(1)
         if hasattr(stdscr, 'immedok'):
             stdscr.immedok(1)
+            stdscr.immedok(0)
         stdscr.insch('c')
         stdscr.insdelln(1)
         stdscr.insnstr('abc', 3)
@@ -176,26 +177,27 @@
         stdscr.setscrreg(10,15)
         win3 = stdscr.subwin(10,10)
         win3 = stdscr.subwin(10,10, 5,5)
-        if hasattr(stdscr, 'syncok'):
+        if hasattr(stdscr, 'syncok') and not sys.platform.startswith("sunos"):
             stdscr.syncok(1)
         stdscr.timeout(5)
         stdscr.touchline(5,5)
         stdscr.touchline(5,5,0)
         stdscr.vline('a', 3)
         stdscr.vline('a', 3, curses.A_STANDOUT)
-        stdscr.chgat(5, 2, 3, curses.A_BLINK)
-        stdscr.chgat(3, curses.A_BOLD)
-        stdscr.chgat(5, 8, curses.A_UNDERLINE)
-        stdscr.chgat(curses.A_BLINK)
+        if hasattr(stdscr, 'chgat'):
+            stdscr.chgat(5, 2, 3, curses.A_BLINK)
+            stdscr.chgat(3, curses.A_BOLD)
+            stdscr.chgat(5, 8, curses.A_UNDERLINE)
+            stdscr.chgat(curses.A_BLINK)
         stdscr.refresh()
 
         stdscr.vline(1,1, 'a', 3)
         stdscr.vline(1,1, 'a', 3, curses.A_STANDOUT)
 
-        if hasattr(curses, 'resize'):
-            stdscr.resize()
-        if hasattr(curses, 'enclose'):
-            stdscr.enclose()
+        if hasattr(stdscr, 'resize'):
+            stdscr.resize(25, 80)
+        if hasattr(stdscr, 'enclose'):
+            stdscr.enclose(10, 10)
 
         self.assertRaises(ValueError, stdscr.getstr, -400)
         self.assertRaises(ValueError, stdscr.getstr, 2, 3, -400)
@@ -423,6 +425,8 @@
 
     def test_issue13051(self):
         stdscr = self.stdscr
+        if not hasattr(stdscr, 'resize'):
+            raise unittest.SkipTest('requires curses.window.resize')
         box = curses.textpad.Textbox(stdscr, insert_mode=True)
         lines, cols = stdscr.getmaxyx()
         stdscr.resize(lines-2, cols-2)
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index 2a2eed2..7962936 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -941,7 +941,7 @@
 #endif
 
 /* chgat, added by Fabian Kreutz <fabian.kreutz at gmx.net> */
-
+#ifdef HAVE_CURSES_WCHGAT
 static PyObject *
 PyCursesWindow_ChgAt(PyCursesWindowObject *self, PyObject *args)
 {
@@ -994,7 +994,7 @@
     }
     return PyCursesCheckERR(rtn, "chgat");
 }
-
+#endif
 
 static PyObject *
 PyCursesWindow_DelCh(PyCursesWindowObject *self, PyObject *args)
@@ -1985,7 +1985,9 @@
     {"attron",          (PyCFunction)PyCursesWindow_AttrOn, METH_VARARGS},
     {"attrset",         (PyCFunction)PyCursesWindow_AttrSet, METH_VARARGS},
     {"bkgd",            (PyCFunction)PyCursesWindow_Bkgd, METH_VARARGS},
+#ifdef HAVE_CURSES_WCHGAT
     {"chgat",           (PyCFunction)PyCursesWindow_ChgAt, METH_VARARGS},
+#endif
     {"bkgdset",         (PyCFunction)PyCursesWindow_BkgdSet, METH_VARARGS},
     {"border",          (PyCFunction)PyCursesWindow_Border, METH_VARARGS},
     {"box",             (PyCFunction)PyCursesWindow_Box, METH_VARARGS},
diff --git a/configure b/configure
index 00cfd64..30df2ce 100755
--- a/configure
+++ b/configure
@@ -15912,6 +15912,36 @@
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for wchgat" >&5
+$as_echo_n "checking for wchgat... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <curses.h>
+int
+main ()
+{
+
+#ifndef wchgat
+void *x=wchgat
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+$as_echo "#define HAVE_CURSES_WCHGAT 1" >>confdefs.h
+
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for filter" >&5
 $as_echo_n "checking for filter... " >&6; }
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
diff --git a/configure.ac b/configure.ac
index 724f7ce..fd15868 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5033,6 +5033,17 @@
   [AC_MSG_RESULT(no)]
 )
 
+AC_MSG_CHECKING(for wchgat)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <curses.h>]], [[
+#ifndef wchgat
+void *x=wchgat
+#endif
+]])],
+  [AC_DEFINE(HAVE_CURSES_WCHGAT, 1, Define if you have the 'wchgat' function.)
+   AC_MSG_RESULT(yes)],
+  [AC_MSG_RESULT(no)]
+)
+
 AC_MSG_CHECKING(for filter)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <curses.h>]], [[
 #ifndef filter
diff --git a/pyconfig.h.in b/pyconfig.h.in
index f630224..5f8b09a 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -179,6 +179,9 @@
 /* Define if you have the 'use_env' function. */
 #undef HAVE_CURSES_USE_ENV
 
+/* Define if you have the 'wchgat' function. */
+#undef HAVE_CURSES_WCHGAT
+
 /* Define to 1 if you have the declaration of `isfinite', and to 0 if you
    don't. */
 #undef HAVE_DECL_ISFINITE