Hi all.
I knew it wasn't that easy!
I've downloaded the source code from
http://sourceforge.net/projects/cryptopp/ and it was a *.zip file with a
bunch of *.ccp and *.dat files plus a file called GNUmakefile. I thought
i had to open the terminal and run GNUmakefile, but it doesn't work. I
tried with ./make and g++ made a bunch of *.o files plus a libcryptopp.a.
What should i do now?

PS: using make to compile aMule tells me this:

checking for crypto++ version >= 5.1... configure: error:
    Could not find cryptopp header file "cryptlib.h".
    Please check if the path "/usr" is valid.
zsh: 10306 exit 1    ./configure