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Well, I seem to have solved the problem in the most random way possible but still it may be good to document it. Trying to fiddle around with the code I got the error : symbol lookup error:

/usr/lib/libgsl.so.0: undefined symbol: cblas_dtrsv

Searching, I found that this error is caused by a linker called libutils-gold

I sudo apt-get purge'd it, relinked and recompiled and lo and behold everything is working normally (for the time being at least)

Maybe someone should add it to the laser scan matcher documentation to avoid such unecesary frustration