Thuan,

the suitesparse package on ROS does not need libg2c.  You probably have 
the Ubuntu suitesparse package installed, which does require it.

1. Uninstall suitesparse (use the synaptic package manager)
2. roscd to suitesparse, make sure you have the latest version (svn up), 
and then run:

make purge
rosmake.

Cheers --Kurt

Vu Hong Thuan wrote:
> Thanks.
> I've tried to build sba. But I can't build the package suitesparse.
> It announce the error of missing library -lg2c.
> Where could I find library libg2c.
> I'm using Ubuntu Karmic 9.10
> Best regard.
> Thuan
> 
> Le 25/03/2010 01:53, Kurt Konolige a écrit :
>> Vu, please don't build visodo, it's going to be deleted soon.  "sba"
>> should be ok at this point.
>>
>> Cheers --Kurt
>>
>> On Wed, Mar 24, 2010 at 11:27 AM, Vu Hong Thuan<thuanvh@gmail.com>  wrote:
>>
>>> I build visodo, but I get the error of missing library -lg2c in building
>>> the package dependant suitesparse.
>>> Where could I find -lg2c?
>>> And sba, I'll try it.
>>> Thanks.
>>> Thuan
>>>
>>> Le 25/03/2010 00:10, Kurt Konolige a écrit :
>>>
>>>> Visodo is being refactored; the only currently compilable package is
>>>> "sba", which implements several sparse bundle adjustment back-ends for
>>>> VSLAM.
>>>>
>>>> Cheers --Kurt
>>>>
>>>> On Mon, Mar 22, 2010 at 6:46 PM, Brian Gerkey<gerkey@willowgarage.com>    wrote:
>>>>
>>>>
>>>>> On Mon, Mar 22, 2010 at 7:19 AM, Vu Hong Thuan<thuanvh@gmail.com>    wrote:
>>>>>
>>>>>
>>>>>> I'm newbie with ROS. I find the source of visual odometry dans the track
>>>>>> trunk.
>>>>>> I tried to compile this package, but all are not successful.
>>>>>> Could you show me how to compile the code from trunk?
>>>>>>
>>>>>>
>>>>> Could you post the compile error that you're encountering?
>>>>>
>>>>>          brian.
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