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[100%] Built target data
Linking CXX executable ../../lib/openwalnut/data/unittest_WReaderEEGASCII
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_start'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_finish'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_sdmult'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_free_sparse'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_read_sparse'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libbiosig.so: undefined reference to `cholmod_print_sparse'
collect2: ld returned 1 exit status
make[2]: *** [lib/openwalnut/data/unittest_WReaderEEGASCII] Error 1
make[1]: *** [modules/data/CMakeFiles/unittest_WReaderEEGASCII.dir/all] Error 2
make: *** [all] Error 2

Searching for the @cholmod_start@ symbol inside biosig gives:

> nm -D `locate libbiosig.so` | grep cholmod_start
      U cholmod_start
      U cholmod_start
      U cholmod_start
>

There was a similar problem with @sigviewer@ described at: https://bugs.launchpad.net/ubuntu/+source/sigviewer/+bug/803196. But the solution was not obvious.

(from redmine: created on 2011-11-15, closed on 2012-12-06)