using an external preprocessor from ROOT prompt

Dear experts,

I was wondering if it is possible to enable the use of an external preprocessor inside ROOT. I read that there are some command line options for CINT itself - what I want to do is to enable it within ROOT. I checked TCint documentation but did not see any mention of the preprocessor or passing command line arguments to TCint instances.

Cheers,
e.

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V. Erkcan Ozcan
Research Fellow
University College London
Dept. of Physics & Astronomy