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While trying to build up latest (1.1.0) libtheora, I got following:

% ./configure       
checking build system type... ./config.guess: unable to guess system type

This script, last modified 2002-07-23, has failed to recognize
the operating system you are using. It is advised that you
download the most up to date version of the config scripts from

    ftp://ftp.gnu.org/pub/gnu/config/

If the version you run (./config.guess) is already up to date, please
send the following data and any information you think might be
pertinent to <config-patches@gnu.org> in order to provide the needed
information to handle your system.

config.guess timestamp = 2002-07-23

uname -m = mips64
uname -r = 2.6.27.1-medan
uname -s = Linux
uname -v = #1 PREEMPT Thu Feb 5 11:31:12 CST 2009

/usr/bin/uname -p = 
/bin/uname -X     = 

hostinfo               = 
/bin/universe          = 
/usr/bin/arch -k       = 
/bin/arch              = 
/usr/bin/oslevel       = 
/usr/convex/getsysinfo = 

UNAME_MACHINE = mips64
UNAME_RELEASE = 2.6.27.1-medan
UNAME_SYSTEM  = Linux
UNAME_VERSION = #1 PREEMPT Thu Feb 5 11:31:12 CST 2009
configure: error: cannot guess build type; you must specify one

After an updating of config.guess (following ftp://ftp.gnu.org/pub/gnu/config/ link) everything after that works fine.