MacPorts base fail to build for x86_64 on 10.6.8

[barracuda156]

It pulls from somewhere a wrong arch flag here:

gcc-4.2 -m64 -arch x86_64 -std=gnu99 -g -O2 -std=c99 -Wextra -Wall   -fPIC -arch x86_64 -arch i386 -DHAVE_CONFIG_H -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I. -I/Users/svacchanda/Downloads/MacPorts-2.7.2/vendor/vendor-destroot/opt/x86_64/libexec/macports/include -I./../compat  -c -o access.o access.c
gcc-4.2 -m64 -arch x86_64 -std=gnu99 -g -O2 -std=c99 -Wextra -Wall   -fPIC -arch x86_64 -arch i386 -DHAVE_CONFIG_H -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I. -I/Users/svacchanda/Downloads/MacPorts-2.7.2/vendor/vendor-destroot/opt/x86_64/libexec/macports/include -I./../compat  -c -o close.o close.c
gcc-4.2 -m64 -arch x86_64 -std=gnu99 -g -O2 -std=c99 -Wextra -Wall   -fPIC -arch x86_64 -arch i386 -DHAVE_CONFIG_H -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I. -I/Users/svacchanda/Downloads/MacPorts-2.7.2/vendor/vendor-destroot/opt/x86_64/libexec/macports/include -I./../compat  -c -o darwintrace.o darwintrace.c
gcc-4.2 -m64 -arch x86_64 -std=gnu99 -g -O2 -std=c99 -Wextra -Wall   -fPIC -arch x86_64 -arch i386 -DHAVE_CONFIG_H -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I/Users/svacchanda/Downloads/MacPorts-2.7.2/src -I. -I/Users/svacchanda/Downloads/MacPorts-2.7.2/vendor/vendor-destroot/opt/x86_64/libexec/macports/include -I./../compat  -c -o dup2.o dup2.c
lipo: /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccekUkEL.out and /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccki5osG.out have the same architectures (x86_64) and can't be in the same fat output file
make[2]: *** [access.o] Error 1
make[2]: *** Waiting for unfinished jobs....
lipo: /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccCWnuW9.out and /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccZMLTvz.out have the same architectures (x86_64) and can't be in the same fat output file
make[2]: *** [close.o] Error 1
lipo: /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccRNGUmA.out and /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccrRDdP0.out have the same architectures (x86_64) and can't be in the same fat output file
make[2]: *** [dup2.o] Error 1
lipo: /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//ccb0Wnm0.out and /var/folders/RY/RYtBnu68EFaDL2tpwUXYIU+++TI/-Tmp-//cchSUgcT.out have the same architectures (x86_64) and can't be in the same fat output file
make[2]: *** [darwintrace.o] Error 1
make[1]: *** [all] Error 1
make: *** [all] Error 1

Configure line:

./configure --prefix=/opt/x86_64 --build=x86_64-apple-darwin10 --with-applications-dir=/opt/x86_64/Applications --without-startupitems CC='gcc-4.2 -m64 -arch x86_64' CXX='g++-4.2 -m64 -arch x86_64'