Windows 64 bit builds?
Nim compilation fails for me with this error:

```
      Info: Nim 0.17.0 already downloaded
 Extracting nim-0.17.0.tar.gz
   Building Nim 0.17.0
 Exception: Execution failed with exit code 1
        ... Command: build.bat
        ... Output: gcc -w -O3 -fno-strict-aliasing -Ic_code -c c_code\1_1\compiler_nim.c -o c_code\1_1\compiler_nim.o
        ... In file included from c_code\1_1\compiler_nim.c:7:0:
        ... c_code/nimbase.h:482:13: error: size of array 'Nim_and_C_compiler_disagree_on_target_architecture' is negative
        ...  typedef int Nim_and_C_compiler_disagree_on_target_architecture[sizeof(NI) == sizeof(void*) && NIM_INTBITS == sizeof(NI)*8 ? 1 : -1];
        ...              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        ... FAILURE
        ... CSource compilation failed. Please check that the gcc compiler is in
        ... the PATH environment variable, and that you are calling the batch script
        ... that matches the target architecture of the compiler.
   Cleaning failed build
       Tip: 1 messages have been suppressed, use --verbose to show them.
     Error: Build failed
        1 file(s) copied.
            Work finished.
            Now you must ensure that the Nimble bin dir is in your PATH:
              C:\Users\moigagoo\.nimble\bin
Press any key to continue . . .
```

I think that's because I have 64 bit version of gcc installed, whereas the sources are expected to be compiled with a 32 bit version.