Thank you for all the replies!
Just want to give a heads up that the latest MLNX_OFED gets rebuilt without any problems. The versions are:
MLNX_OFED_LINUX-2.4-1.0.0
Linux XenServer-6.2 2.6.32.43-0.4.1.xs1.8.0.855.170800xen #1 SMP Mon Jul 21 05:12:35 EDT 2014 i686 i686 i386 GNU/Linux
XenServer DDK 6.2.0-87218c
Does anyone know when does the version for XenServer 6.5 is expected to be released?