Debian/AMD64 compilation: No go

I bought Torque today, and have installed the files on three systems.
One is WindowsXP, where the installer did the right thing, and the
core library compiled without a hitch. Good thing, since I'm shaky on
Visual Studio these days :)

The other box is an Athlon 64 running Debian AMD64. Things didn't go
so smoothly there - first the installer is a 32-bit executable that refuses
to run. I haven't looked into making 32-bit chroot() jails yet, so I used
the third box to install and copied over (this is an old PIII serving up
private SubVersion sourcecode).

Once I got it to the Athlon 64, I had to reconfigure to compile with GCC
3.x, since I got a message that x86-64 wasn't supported. That didn't
help much. Now I get this:

:~/src/torque$ make

(skipped successful compile of three files)

--> Compiling lpng/pngget.c
lpng/pngget.c: In function 'png_get_IHDR':
lpng/pngget.c:577: error: unrecognizable insn:
(insn:HI 191 190 93 14 0x2a95c9f420 (set (reg/v:SI 69)
        (plus:SI (mult:SI (reg/v:SI 69)
                (const_int 2 [0x2]))
            (const_int 1 [0x1]))) -1 (insn_list 190 (nil))
    (nil))
lpng/pngget.c:577: internal compiler error: in extract_insn, at recog.c:2175
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
For Debian GNU/Linux specific bug reporting instructions, see
<URL:file:///usr/share/doc/gcc-3.3/README.Bugs>.
make[1]: *** [out.GCC3.RELEASE/lpng/pngget.obj] Error 1
make: *** [default] Error 2

Looks like we're moving into assembly territory here, where I don't
want to be :)

This is on kernel 2.6.9, tested with both GCC 3.3.5-3 and
GCC 3.4.3-2 (prerelease).

Anyone else had success on *any* x86-64 based system, and if so,
what GCC version(s)? I'm not so sure I want to change to another
distro (even if still sticking to one of the Debian AMD64 variants).

Until I find a solution, I'll be digging into the sourcecode from the
Win32 side of things. Any help getting the thing compiling on Linux
is muchly appreciated :)