Michel Bardiaux <mbardiaux@peaktime.be> writes: > > Jens Hillenbach wrote: >> /Jens/gmp-4.0.1/cxx/osmpz.cc:38: undefined reference to `__gmpz_get_str' > > Going out on a limb here (pun intended!) since I use neither cygwin > nor C++, but... don't you need -lgmp too? Yes, "-lgmpxx -lgmp" for C++. See "Headers and Libraries" in the manual.