# Building Ruby 1.9.1 pre fails on windows

**URL:** <https://www.ruby-forum.com/t/building-ruby-1-9-1-pre-fails-on-windows/152858>\
**Category:** Ruby\
**Created:** [November 8, 2008, 11:22am UTC](https://www.ruby-forum.com/t/building-ruby-1-9-1-pre-fails-on-windows/152858 "2008-11-08T11:22:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![okiess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/e9c0ed/32.png) [@okiess](https://www.ruby-forum.com/u/okiess)\
**Post date:** [November 8, 2008, 11:22am UTC](https://www.ruby-forum.com/t/building-ruby-1-9-1-pre-fails-on-windows/152858/1 "2008-11-08T11:22:27Z")

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Hello,  
I come to the step where I am told to run nmake.  
Running nmake yields:

* * *

```
     -I./.. ./../tool/compile_prelude.rb ./../prelude.rb

```

miniprelude.c  
‘-I.’ is not recognized as an internal or external command,  
operable program or batch file.  
NMAKE : fatal error U1077: ‘-I.’ : return code ‘0x1’  
Stop.

* * *

after the first few files have been compiled.

I would appreciate your help

regards, Oliver