diff --git a/ncurses/base/sigaction.c b/ncurses/base/sigaction.c
new file mode 100644
index 0000000..36442e0
--- /dev/null
+++ b/ncurses/base/sigaction.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
+ *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
+ *     and: Thomas E. Dickey                        1996-2003               *
+ ****************************************************************************/
+
+/* This file provides sigaction() emulation using sigvec() */
+/* Use only if this is non POSIX system */
+
+MODULE_ID("$Id: sigaction.c,v 1.14 2003/12/07 01:06:52 tom Exp $")
+
+static int
+_nc_sigaction(int sig, sigaction_t * sigact, sigaction_t * osigact)
+{
+    return sigvec(sig, sigact, osigact);
+}
+
+static int
+_nc_sigemptyset(sigset_t * mask)
+{
+    *mask = 0;
+    return 0;
+}
+
+static int
+_nc_sigprocmask(int mode, sigset_t * mask, sigset_t * omask)
+{
+    sigset_t current = sigsetmask(0);
+
+    if (omask)
+	*omask = current;
+
+    if (mode == SIG_BLOCK)
+	current |= *mask;
+    else if (mode == SIG_UNBLOCK)
+	current &= ~*mask;
+    else if (mode == SIG_SETMASK)
+	current = *mask;
+
+    sigsetmask(current);
+    return 0;
+}
+
+static int
+_nc_sigaddset(sigset_t * mask, int sig)
+{
+    *mask |= sigmask(sig);
+    return 0;
+}
+
+/* not used in lib_tstp.c */
+#if 0
+static int
+_nc_sigsuspend(sigset_t * mask)
+{
+    return sigpause(*mask);
+}
+
+static int
+_nc_sigdelset(sigset_t * mask, int sig)
+{
+    *mask &= ~sigmask(sig);
+    return 0;
+}
+
+static int
+_nc_sigismember(sigset_t * mask, int sig)
+{
+    return (*mask & sigmask(sig)) != 0;
+}
+#endif