Error incompatible library version for module
Q: Running GRASS, I get this error message:
"ERROR: Incompatible library version for module. You need to rebuild GRASS or untangle multiple installations"
What's that? What should I do?
A: Likely you have a self-compiled GRASS version (which is fine). So? When doing update from SVN which contains a change in the core GIS library, and a subsequent recompilation without having run "make distclean" before, this error is issued to avoid incompatibility problems.
Solution
Prepare and recompile your source code copy in this way:
make distclean svn up ./configure ... make make install
Note: If you use the GDAL-GRASS plugin then also recompile and reinstall it - "just to be sure".