Interestingly, you don't say what machine you're running Mandrake on... I'm going to guess that it's an x86 (Intel) machine.
As far as I know, Solaris 2.6 is for Sparc architectures.
If that the 2 statements above are true. Then you will not get your help desk running on Mandrake linux. Because the instruction sets of the machines (Sparc vs Intel) are completely different.
If however, you are running on a Sparc, it is still very unlikely that you will get them working.
Sun does have a version of solaris for the X86 architecture but your helpdesk software must also be compiled for x86.
Bottom line ...
You're not likely to get this working.