Ok, i can confirm this behavior: 10.0 with FBSD10_FIX: installs libxml.so -> libxml.so.9 10.0 without FBSD10_FIX: not installs any *.so files 10.0 with UNAME_r 9.9: installs libxml.so -> libxml.so.5 Is there any chance that FBSD10_FIX changes shared library version as side effect?