problem migrating from sarge to etch

["enediel gonzalez" <enediel@hotmail.com>]

Hello

I just installed etch, and tried to install ntop from the source code, but I 
receive the following error

checking how to run the C++ preprocessor... /lib/cpp
configure: error: C++ preprocessor "/lib/cpp" fails sanity check

checking into the debian's site, I noticed that this file existed in one of 
the sarge's package, but the file /lib/cpp is not included in any package in 
etch.

Thanks in advance for any suggestion how to solve this problem
Enediel
Linux user 300141
Debian GNU/Linux

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