Our buildbot builds and tests every commit to LinuxCNC on Ubuntu Precise, both 
in 32-bit and 64-bit, and we are not seeing any problems there.  I think your 
build machine is set up wrong somehow.

Do you have all the build dependencies installed correctly?  Try this (from the 
top-level directory of a git clone of linuxcnc):

cd debian
./configure sim
cd ..
dpkg-checkbuilddeps


On Feb 19, 2012, at 02:10 , tuxcnc wrote:

> I have no libmodbus in my system.
> Installing libmodbus-dev gets no changes.
> 
> There are two questions :
> 
> 1. Why ?
> 2. Why when linking classicladder and in socket_modbus_master.o ?
> 
> 1.
> It is not first and nod last surprise from gcc developers.
> They are rebuilding libraries without back compability.
> 
> 2.
> In my opinion it is bad code in linuxcnc.
> This code was work, but will not
> 
> 12.04 is LTS and Xubuntu is light and simple like old Gnome.
> It is good choice get Xubuntu Precise for linuxcnc platform.
> In my opinion linuxcnc must work on this system.
> On 32 and 64 bit.
> 
> Adam.
> 
> W dniu 18.02.2012 23:34, andy pugh pisze:
>> On 18 February 2012 21:56, tuxcnc<[email protected]>  wrote:
>> 
>>> /usr/bin/ld: objects/hal/classicladder/socket_modbus_master.o: undefined
>> Possibly linked to:
>> http://thread.gmane.org/gmane.linux.distributions.emc.devel/5879/focus=5915
>> ?
> 
> 
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-- 
Sebastian Kuzminsky


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