diff -urN screen-4.0.2/configure screen-4.0.2.cygwin/configure
--- screen-4.0.2/configure	2003-12-05 22:46:53.000000000 +0900
+++ screen-4.0.2.cygwin/configure	2007-03-21 13:27:25.202073400 +0900
@@ -4156,6 +4156,7 @@
 fi
 rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
 
+#if 0
 { echo "$as_me:$LINENO: checking fifos..." >&5
 echo "$as_me: checking fifos..." >&6;}
 if test "$cross_compiling" = yes; then
@@ -4236,6 +4237,7 @@
     exit(1);
   exit(0);
 }
+#endif
 
 _ACEOF
 rm -f conftest$ac_exeext
diff -urN screen-4.0.2/misc.c screen-4.0.2.cygwin/misc.c
--- screen-4.0.2/misc.c	2003-12-05 22:45:41.000000000 +0900
+++ screen-4.0.2.cygwin/misc.c	2007-03-21 13:33:30.661221900 +0900
@@ -613,7 +613,7 @@
    */
 # endif /* NEEDSETENV */
 #else /* USESETENV */
-# if defined(linux) || defined(__convex__) || (BSD >= 199103)
+# if defined(linux) || defined(__convex__) || (BSD >= 199103) || defined(__CYGWIN__)
   setenv(var, value, 1);
 # else
   setenv(var, value);
diff -urN screen-4.0.2/pty.c screen-4.0.2.cygwin/pty.c
--- screen-4.0.2/pty.c	2003-09-08 23:26:18.000000000 +0900
+++ screen-4.0.2.cygwin/pty.c	2007-03-21 13:40:14.275615400 +0900
@@ -34,7 +34,7 @@
 #endif
 
 /* for solaris 2.1, Unixware (SVR4.2) and possibly others */
-#ifdef HAVE_SVR4_PTYS
+#if defined(HAVE_SVR4_PTYS) && !defined(__CYGWIN__)
 # include <sys/stropts.h>
 #endif
 
Files screen-4.0.2/screen.exe and screen-4.0.2.cygwin/screen.exe differ
diff -urN screen-4.0.2/utmp.c screen-4.0.2.cygwin/utmp.c
--- screen-4.0.2/utmp.c	2003-09-08 23:27:17.000000000 +0900
+++ screen-4.0.2.cygwin/utmp.c	2007-03-21 13:37:55.204253900 +0900
@@ -589,7 +589,7 @@
 struct utmp *u;
 {
   u->ut_type = DEAD_PROCESS;
-#if !defined(linux) || defined(EMPTY)
+#if !( defined(linux) || defined(__CYGWIN__) ) || defined(EMPTY) 
   u->ut_exit.e_termination = 0;
   u->ut_exit.e_exit = 0;
 #endif