[Flow-tools] error in installing flowtool

[Joseph NDONG]

Hello,
I have a problem when installing flow tool
The first error I met that the compiler could not recognize this (char*)ptr
+= nwritten; I have replace it with this one
ptr = (void*)( ((char*)ptr) + nwritten); and it works well.
But I have another problem, this line can't compile:
      (char*)ftch->traverse_rec += ftch->d_size;
This is the part of the error message:
fi
ftchash.c: Dans la fonction «ftchash_foreach» :
ftchash.c:329: erreur: lvalue required as left operand of assignment
make[2]: *** [ftchash.o] Erreur 1
make[2]: Quitte le répertoire `/home/joseph/flow-tools-0.66/lib'
make[1]: *** [all] Erreur 2
make[1]: Quitte le répertoire `/home/joseph/flow-tools-0.66/lib'
make: *** [all-recursive] Erreur 1

If someone can help me, please.
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