building master with boost

[Carsten Rinke]

Hi,

to check if some "front-porting" is working, I tried to compile on the 
master branch - for the first time.

It told me that boost is missing:

checking for boostlib >= 1.48.0... configure: We could not detect the 
boost libraries (version 1.48 or higher). If you have a staged boost 
library (still not installed) please specify $BOOST_ROOT in your 
environment and do not give a PATH to --with-boost option.  If you are 
sure you have boost installed, then check your version number looking in 
<boost/version.hpp>. See http://randspringer.de/boost for more 
documentation.
configure: error: Boost 1.48.0 or later was not found and is required to 
build GnuCash

So I downloaded Boost 1.56.0 into "/opt/lib/boost/boost_1_56_0".

Running configure with an environment variable
echo $BOOST_ROOT -> /opt/lib/boost/boost_1_56_0
does not change anything.

Running configure with
--with-boost "/opt/lib/boost/boost_1_56_0"
results in:
checking build system type... Invalid configuration 
`/opt/lib/boost/boost_1_56_0': machine `/opt/lib/boost/boost_1_56_0' not 
recognized
configure: error: /bin/bash ../config.sub /opt/lib/boost/boost_1_56_0 failed

What can I do?

Kind regards,
Carsten