Looks like a version mismatch. At some places, it's libflow-0.6.so and at some other places it libflow-0.5.so. You may have two versions conflicting. BTW, libflow-0.6 means that you got a recent CVS version (0.6.0 is not yet released). Please update it, as there have been a couple instabilities this week (it's fixed now). I suggest you make sure you don't have any Overflow rpm installed and then "rm -rf /opt/overflow". Also, as I told you it's now recommended to install Overflow with prefix=/usr /usr/local or /opt The conflicting include problem is now solved. The includes are now in $(prefix)/include/overflow instead of just $(prefix)/include. Jean-Marc