need CC
need CFLAGS

make test_2.o from test_2.c using {
  mexec $CC $CFLAGS -c test_2.c
}

make test_lib.a from [list test_2.o test_3.c] using {
  mexec $CC $CFLAGS -c test_3.c
  mexec ar cr test_lib.a test_2.o test_3.o
  mexec ranlib test_lib.a
}

make a.exe from [list test_1.c test_lib.a] using {
  mexec $CC $CFLAGS test_1.c test_lib.a -o a.exe
}

make clean from {} using {
  foreach f [glob -nocomplain *.o *.a *.core] {
    file delete $f
  }
  catch {file delete a.exe}
}