Looks like that code is old. The -fforce-mem
option hasn't been supported in GCC for many years. See, for example, gcc's -fforce-mem option.
If you just want to get this working I recommend you look through the Makefile
files for references to -fforce-mem
and simply remove that flag. Note that every time you re-run configure
you'll have to do it again, though, since the Makefile
files will be recreated.
If you want to fix it "for real" you'll have to go find the places in autoconf and automake files that use it and remove it from there.
I also find it very strange that the code is forcing the architecture to be i486
which is really old and will be much slower. Unless you really do have an i486
, which I find pretty unlikely in 2014.