os x error while compiling mozart oz

mozart oz error

stewarts-MacBook-Pro-15:build stewart$ make
dirs="platform share contrib doc"; \
	for i in $dirs; do \
	  if (cd $i && make bootstrap); \
          then true; \
          else exit 1; \
          fi; \
        done
dirs="dss emulator wish tools"; \
	for i in $dirs; do \
	  if (cd $i && make bootstrap); \
          then true; \
          else exit 1; \
          fi; \
        done
g++ -march=i386 -mtune=i386 -O3 -fomit-frame-pointer -funsigned-char -I. -I/Users/stewart/dev/mozart/mozart/platform/dss/include -Wdisabled-optimization -Wuninitialized -Wall -Wold-style-cast -Woverloaded-virtual -Wshadow -Wswitch -Wreturn-type -Wunused -fPIC   -c -o base.o /Users/stewart/dev/mozart/mozart/platform/dss/src/base.cc
/Users/stewart/dev/mozart/mozart/platform/dss/src/base.cc:1: error: CPU you selected does not support x86-64 instruction set
/Users/stewart/dev/mozart/mozart/platform/dss/src/base.cc:1: error: CPU you selected does not support x86-64 instruction set
make[2]: *** [base.o] Error 1
make[1]: *** [bootstrap] Error 1
make: *** [bootstrap] Error 1