diff -ur stunnel-4.27-org/src/options.c stunnel-4.27/src/options.c
--- stunnel-4.27-org/src/options.c      2009-04-16 10:49:20.000000000 +0200
+++ stunnel-4.27/src/options.c  2009-04-30 16:35:41.000000000 +0200
@@ -1718,6 +1718,15 @@
     {"SO_DEBUG",        SOL_SOCKET,  SO_DEBUG,        TYPE_FLAG,    DEF_VALS},
     {"SO_DONTROUTE",    SOL_SOCKET,  SO_DONTROUTE,    TYPE_FLAG,    DEF_VALS},
     {"SO_KEEPALIVE",    SOL_SOCKET,  SO_KEEPALIVE,    TYPE_FLAG,    DEF_VALS},
+#ifdef TCP_KEEPCNT
+    {"TCP_KEEPCNT",     SOL_TCP,     TCP_KEEPCNT,     TYPE_INT,     DEF_VALS},
+#endif
+#ifdef TCP_KEEPIDLE
+    {"TCP_KEEPIDLE",    SOL_TCP,     TCP_KEEPIDLE,    TYPE_INT,     DEF_VALS},
+#endif
+#ifdef TCP_KEEPINTVL
+    {"TCP_KEEPINTVL",   SOL_TCP,     TCP_KEEPINTVL,   TYPE_INT,     DEF_VALS},
+#endif
     {"SO_LINGER",       SOL_SOCKET,  SO_LINGER,       TYPE_LINGER,  DEF_VALS},
     {"SO_OOBINLINE",    SOL_SOCKET,  SO_OOBINLINE,    TYPE_FLAG,    DEF_VALS},
     {"SO_RCVBUF",       SOL_SOCKET,  SO_RCVBUF,       TYPE_INT,     DEF_VALS},