Indeed I have tried to build WINE from source as follows: ./configure --disable-win16 --enable-win64 --verbose --without-freetype The configure completes without errors but a number of warnings: configure: libhal/libdbus 64-bit development files not found, no dynamic device support. configure: libgnutls 64-bit development files not found, no schannel support. configure: libsane 64-bit development files not found, scanners won't be supported. configure: libgphoto2 64-bit development files not found, digital cameras won't be supported. configure: liblcms 64-bit development files not found, Color Management won't be supported. configure: libcapi20 64-bit development files not found, ISDN won't be supported. configure: fontconfig 64-bit development files not found, fontconfig won't be supported. configure: libgsm 64-bit development files not found, gsm 06.10 codec won't be supported. configure: libmpg123 64-bit development files not found (or too old), mp3 codec won't be supported. configure: WARNING: OpenGL development headers not found. OpenGL and Direct3D won't be supported. configure: WARNING: libxml2 64-bit development files not found, XML won't be supported. configure: WARNING: libxslt 64-bit development files not found, xslt won't be supported. configure: WARNING: libjpeg 64-bit development files not found, JPEG won't be supported. configure: WARNING: libpng 64-bit development files not found, PNG won't be supported. configure: Finished. Do 'make depend && make' to compile Wine. When I try to actually build (make depend && make) I get stopped with the following message: gcc -m64 -c -I. -I. -I../../include -I../../include -D__WINESRC__ -D_REENTRANT -fPIC -Wall -pipe -fno-strict-aliasing -Wdeclaration-after-statement -Wstrict-prototypes -Wwrite-strings -Wpointer-arith -g -O2 -o interlocked.o interlocked.c {standard input}:87:Unknown pseudo-op: .cfi_adjust_cfa_offset {standard input}:87:Rest of line ignored. 1st junk character valued 56 (8). {standard input}:88:Unknown pseudo-op: .cfi_rel_offset {standard input}:88:Rest of line ignored. 1st junk character valued 37 (%). {standard input}:99:Unknown pseudo-op: .cfi_adjust_cfa_offset {standard input}:99:Rest of line ignored. 1st junk character valued 45 (-). {standard input}:100:Unknown pseudo-op: .cfi_same_value {standard input}:100:Rest of line ignored. 1st junk character valued 37 (%). make[2]: *** [interlocked.o] Error 1 make[1]: *** [port] Error 2 make: *** [libs] Error 2 Any ideas? Do I need to boot into the 64-bit Snow Leopard kernel to build 64-bit WINE? In this case the gcc compiler is already 64-bit by default, although I am not sure about of the libraries that it requires. Unfortunately it seems on my particular Mac Pro 2,1 I am not sure if it is possible/supported to boot into the 64-bit kernel as I have a slightly older 32-bit EFI on this machine. Do I just need to disable more parts of the build to get it to go? Thanks, Thomas