Emphasize in guides that all this is optional.

0406-Compilation-Zoltan-Linux.md

 Compiling INMOST with Zoltan on Linux
 ======
 
+INMOST may be configured with optional Zoltan support. In this case INMOST will support calling graph partitioners from Zoltan package, i.e. you will be able to use Partitioner::Zoltan_RCB, Partitioner::Zoltan_RIB, Partitioner::Zoltan_HSFC, Partitioner::Zoltan_PHG in Partitioner::SetMethod. 
+If you also provide Parmetis or Scotch libraries to Zoltan then you will be able to use Partitioner::Zoltan_Parmetis or Partitioner::Zoltan_Scotch.
+
 Zoltan is distributed with Trilinos package.
 INMOST is known to work with Zoltan from Trilinos version 11.12.1.
 You are advised to refer to [[Trilinos installation guide|0404-Compilation-Trilinos-Linux]].