Cygwin64 build issues

[jmahood]

For reference, I can build from screen.git on savannah on this system. First, I had warnings during autogen -- maybe my autotools are not compatible?

./autogen.sh
autoheader-2.69: WARNING: Using auxiliary files such as `acconfig.h', `config.h.bot'
autoheader-2.69: WARNING: and `config.h.top', to define templates for `config.h.in'
autoheader-2.69: WARNING: is deprecated and discouraged.
autoheader-2.69:
autoheader-2.69: WARNING: Using the third argument of `AC_DEFINE' and
autoheader-2.69: WARNING: `AC_DEFINE_UNQUOTED' allows one to define a template without
autoheader-2.69: WARNING: `acconfig.h':
autoheader-2.69:
autoheader-2.69: WARNING:   AC_DEFINE([NEED_FUNC_MAIN], 1,
autoheader-2.69:                [Define if a function `main' is needed.])
autoheader-2.69:
autoheader-2.69: WARNING: More sophisticated templates can also be produced, see the
autoheader-2.69: WARNING: documentation.


Then I configured with prefix=/usr/local/opt and ran make.  Using gcc 4.8.2:

gcc -c -I. -I.  -DETCSCREENRC='"/usr/local/opt/etc/screenrc"' -DSCREENENCODINGS='"/usr/local/opt/share/screen/utf8encodings"' -DHAVE_CONFIG_H -DGIT_REV=\""`git describe --always 2>/dev/null`"\" \
     -g -O2 -D_GNU_SOURCE -Wall socket.c
socket.c: In function ‘chsock’:
socket.c:854:2: warning: implicit declaration of function ‘utime’ [-Wimplicit-function-declaration]
  (void)utimes(SocketPath, NULL);
  ^
socket.c: In function ‘PasswordProcessInput’:
socket.c:1090:4: warning: implicit declaration of function ‘crypt’ [-Wimplicit-function-declaration]
    if (strncmp(crypt(pwdata->buf, up), up, strlen(up))) {
    ^
socket.c:1090:4: warning: passing argument 1 of ‘strncmp’ makes pointer from integer without a cast [enabled by default]
In file included from /usr/include/sys/types.h:20:0,


                 from socket.c:30:
/usr/include/string.h:35:6: note: expected ‘const char *’ but argument is of type ‘int’
 int  _EXFUN(strncmp,(const char *, const char *, size_t));
      ^
gcc -c -I. -I.  -DETCSCREENRC='"/usr/local/opt/etc/screenrc"' -DSCREENENCODINGS='"/usr/local/opt/share/screen/utf8encodings"' -DHAVE_CONFIG_H -DGIT_REV=\""`git describe --always 2>/dev/null`"\" \
     -g -O2 -D_GNU_SOURCE -Wall search.c
gcc -c -I. -I.  -DETCSCREENRC='"/usr/local/opt/etc/screenrc"' -DSCREENENCODINGS='"/usr/local/opt/share/screen/utf8encodings"' -DHAVE_CONFIG_H -DGIT_REV=\""`git describe --always 2>/dev/null`"\" \
     -g -O2 -D_GNU_SOURCE -Wall tty.c
tty.c: In function ‘TtyGrabConsole’:
tty.c:937:38: error: ‘TIOCCONS’ undeclared (first use in this function)
     UserReturn(ioctl(consredirfd[1], TIOCCONS, (char *)&on));
                                      ^
tty.c:937:38: note: each undeclared identifier is reported only once for each function it appears in
Makefile:82: recipe for target 'tty.o' failed
make: *** [tty.o] Error 1