Hi, is there a specific reason for commenting the line ... #usr/lib/libboost_math_c99l.so.1.55.0 ... in rootfile for 'boost 1_55_0'? All other '/usr/lib/libboost*'-files are uncommented, only this one is ~deactivated. This came to me while building an update to 'boost 1_58_0'. Regards Matthias