zig build system understands the concept of dependencies

See #204

Author: andrewrk

src/main.cpp

@@ -218,6 +218,7 @@ int main(int argc, char **argv) {
                         "  --build-file [file]    Override path to build.zig.\n"
                         "  --verbose              Print commands before executing them.\n"
                         "  --debug-build-verbose  Print verbose debugging information for the build system itself.\n"
+                        "  --prefix [prefix]      Override default install prefix.\n"
                 , zig_exe_path);
                 return 0;
             }