Hi Tobias,
problems like yours occur quite often when compiling Turbomole with an arbitrary version of the Intel Compiler. We are fighting with ifort since version 8.0, and currently Turbomole 5.9 should be compiled with ifort 9.0.latest - never use an 8 version, that causes a lot of trouble. ifc 7.1 was great, but unused for Turbomole since ages now. ifort 9.1 slowly gets better, so you might give it a try.
Since you are a member of a Turbomole developer group, you should contact the Turbomole support at COSMOlogic or one of the 'old' developers directly.
Regards,
Uwe