building a gcc crosscompiler

[Chuck Robey]

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Since the last time I built a gcc crosscompiler, the gcc folks have added in
dependencies on mpfr and gmp libraries.  When I first read this, I was worried
that I had a chicken/egg problem, but I found that you can do with the host's
version of those libraries.  I found a port of gnu libmpfr, but I notice here
that FreeBSD has it's own libmp, and I don't know if the 4.3.1 version of gnu
gcc can use our libmp, or if I need to install the port "libgmp4" and tell the
gnu gcc configure about which mp I'm using.

So, if you know if I can use FreeBSD's libmp, or if I need to build the ports
libgmp4, please let me know.
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