make all
Building target: test
Invoking: MacOS X C Linker
gcc -o "test" ./test.o
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [test] Error 1