MAMEWorld Forums - EmuChat - ld: unrecognised emulation mode: 64

I'm trying to write an updated Gentoo ebuild for MAME 0.148. I've made quite a bit of progress, but I've hit a roadblock. Here's a snippet of output.

x86_64-pc-linux-gnu-ld -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -m64 obj/sdl/build/verinfo.o obj/sdl/libocore.a -lexpat -lz -lFLAC -lm -ljpeg -lportmidi `pkg-config --libs alsa` -L/usr/lib64/qt4 -lQtGui -lQtCore `sdl-config --libs` `pkg-config --libs fontconfig` -lSDL_ttf -lm -lutil -lX11 -lXinerama `pkg-config --libs gtk+-2.0` `pkg-config --libs gconf-2.0` `pkg-config QtGui --libs` -L/usr/X11/lib -L/usr/X11R6/lib -L/usr/openwin/lib -o obj/sdl/build/verinfo
Linking obj/sdl/build/m68kmake...
x86_64-pc-linux-gnu-ld -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -m64 obj/sdl/emu/cpu/m68000/m68kmake.o obj/sdl/libocore.a -lexpat -lz -lFLAC -lm -ljpeg -lportmidi `pkg-config --libs alsa` -L/usr/lib64/qt4 -lQtGui -lQtCore `sdl-config --libs` `pkg-config --libs fontconfig` -lSDL_ttf -lm -lutil -lX11 -lXinerama `pkg-config --libs gtk+-2.0` `pkg-config --libs gconf-2.0` `pkg-config QtGui --libs` -L/usr/X11/lib -L/usr/X11R6/lib -L/usr/openwin/lib -o obj/sdl/build/m68kmake
x86_64-pc-linux-gnu-ld: unrecognised emulation mode: 64
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om elf_k1om
make: *** [obj/sdl/build/verinfo] Error 1
make: *** Waiting for unfinished jobs....
x86_64-pc-linux-gnu-ld: unrecognised emulation mode: 64
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om elf_k1om
make: *** [obj/sdl/build/m68kmake] Error 1
make: *** wait: No child processes. Stop.

From what I understand, -m32 or -m64 is a valid flag for gcc, but it is not a valid flag for the linker, ld. So I edited src/osd/sdl/sdl.mak and commented out the lines which add -m32 or -m64 to LDFLAGS. However, the compile failed at the same point with the following output.

Linking obj/sdl/build/verinfo...
x86_64-pc-linux-gnu-ld -Wl,-O1 -Wl,--sort-common -Wl,--as-needed obj/sdl/build/verinfo.o obj/sdl/libocore.a -lexpat -lz -lFLAC -lm -ljpeg -lportmidi `pkg-config --libs alsa` -L/usr/lib64/qt4 -lQtGui -lQtCore `sdl-config --libs` `pkg-config --libs fontconfig` -lSDL_ttf -lm -lutil -lX11 -lXinerama `pkg-config --libs gtk+-2.0` `pkg-config --libs gconf-2.0` `pkg-config QtGui --libs` -L/usr/X11/lib -L/usr/X11R6/lib -L/usr/openwin/lib -o obj/sdl/build/verinfo
Linking obj/sdl/build/m68kmake...
x86_64-pc-linux-gnu-ld: unrecognized option '-Wl,-O1'
x86_64-pc-linux-gnu-ld: use the --help option for usage information
make: *** [obj/sdl/build/verinfo] Error 1
make: *** Waiting for unfinished jobs....
x86_64-pc-linux-gnu-ld -Wl,-O1 -Wl,--sort-common -Wl,--as-needed obj/sdl/emu/cpu/m68000/m68kmake.o obj/sdl/libocore.a -lexpat -lz -lFLAC -lm -ljpeg -lportmidi `pkg-config --libs alsa` -L/usr/lib64/qt4 -lQtGui -lQtCore `sdl-config --libs` `pkg-config --libs fontconfig` -lSDL_ttf -lm -lutil -lX11 -lXinerama `pkg-config --libs gtk+-2.0` `pkg-config --libs gconf-2.0` `pkg-config QtGui --libs` -L/usr/X11/lib -L/usr/X11R6/lib -L/usr/openwin/lib -o obj/sdl/build/m68kmake
x86_64-pc-linux-gnu-ld: unrecognized option '-Wl,-O1'
x86_64-pc-linux-gnu-ld: use the --help option for usage information
make: *** [obj/sdl/build/m68kmake] Error 1
make: *** wait: No child processes. Stop.

I'm compiling with the following command:
make -j3 all TARGET=mame BUILD_EXPAT=0 BUILD_FLAC=0 BUILD_JPEGLIB=0 BUILD_MIDILIB=0 BUILD_ZLIB=0 NOWERROR=1 NO_X11=0 DEBUG=0 NO_DEBUGGER=1 NO_OPENGL=0 PROFILER=0 USE_QTDEBUG=0 NO_USE_XINPUT=1

If anyone has any ideas, I'd certainly appreciate it!