I can't compile screen git version

Hi,

I'm trying to compile the screen git version on Ubuntu Natty 64 bits
but I can't.

If I execute "./autogen.sh", it shows these warnings:

configure.in:50: warning: AC_TRY_RUN called without
default to allow cross compiling

configure.in:60: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:67: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:309: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:379: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:433: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:489: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:556: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:681: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:750: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:937: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:1065: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:1166: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:1180: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:1196: warning: AC_TRY_RUN called without default to
allow cross compiling

configure.in:1295: warning: AC_TRY_RUN called without default to
allow cross compiling

autoconf: Undefined macros:

configure.in:48:AC_USE_SYSTEM_EXTENSIONS

The default autoconf version is 2.13.

I configure with: "./configure --enable-locale --enable-colors256
--with-socket-dir=/var/tmp"

But the config.h file is empty and I can't compile.

If I use a more recent autoconf version (2.50), "./autogen.sh"
executes well without warnings but when I execute configure:

config.status: error: cannot find input file:
`config.h.in'

I can compile the last tar.gz version in http://ftp.gnu.org/gnu/screen/
(screen-4.0.3.tar.gz) but how can I compile the git version of
Screen?

Regards.

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