Hello Gerri I tried to build the latest commit on Solaris 5.10 on x86 at slac but it fails with: Compiling XrdOucPup.cc "XrdOucPup.cc", line 180: Error: The function "htonll" must have a prototype. "XrdOucPup.cc", line 310: Error: The function "ntohll" must have a prototype. 2 Error(s) detected. gmake[4]: *** [../../obj/sunx86_510_dbg/XrdOucPup.o] Error 2 If I restore XrdSysPlatform.hh to v3.0.2 it compiles fine. The difference is: % git diff v3.0.2 ./XrdSys/XrdSysPlatform.hh ... -#if !defined(__sun) || (defined(__sun) && (!defined(htonll) || !defined(ntohll))) +#if !defined(__sun) || (defined(__sun) && (!defined(_LP64))) ... I think what is in version v3.0.2 was added because we had an issue with htonll/ntohll compiling on Solaris whereas it worked on OpenSolaris. Cheers, Wilko