The simplest way is just
configure --enable-download Or to compile arpack
Remark:
In arpack++, a lot of incoherance this moderne c++ (g++3 or better) so I write the driver by hand (from version 3). arpack++ in included in FreeFem++ now.
The last one is in lapack lib second.f in an function not a procedure like in arpack.
Two weeks work to find this mistake.
Frederic Hecht