importC error: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/mach/vm_types.h(168): Error: variable `lib_test.mach_vm_range_recipe_v1_t.range` - no definition of struct `mach_vm_range`

[Dakota via Digitalmars-d-learn]

```sh
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/mach/vm_types.h(168):
 Error: variable `lib_test.mach_vm_range_recipe_v1_t.range` - no definition of 
struct `mach_vm_range`
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/mach/vm_types.h(168):
        see https://dlang.org/spec/struct.html#opaque_struct_unions
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/mach/vm_types.h(168):
        perhaps declare a variable with pointer type `mach_vm_range*` instead
```