# Errors running ./build

**URL:** https://community.mrtrix.org/t/errors-running-build/181
**Category:** Uncategorized
**Tags:** installation, linux
**Created:** [April 25, 2016, 5:53am UTC](https://community.mrtrix.org/t/errors-running-build/181 "2016-04-25T05:53:47Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![jdtournier](https://community.mrtrix.org/user_avatar/community.mrtrix.org/jdtournier/32/2594_2.png) [@jdtournier](https://community.mrtrix.org/u/jdtournier)
#### Post date: [April 25, 2016, 7:43am UTC](https://community.mrtrix.org/t/errors-running-build/181/4 "2016-04-25T07:43:30Z")

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I just came across that exact same issue just a few days ago. Grabbing a fresh version of Eigen fixed it for me. Make sure you _don’t_ use their current master branch, grab the latest _release_ snapshot - otherwise you’ll get other types of errors (I’ll have to look into that when I have a minute, I’m hoping it’s a temporary glitch in Eigen’s development branch).

In more detail:

1. download the [latest release version of Eigen](http://bitbucket.org/eigen/eigen/get/3.2.8.tar.gz)

2. put the file in your MRtrix3 folder

3. extract it in place:

4. run configure with the right flags to tell it where to find your local Eigen installation:

5. assuming that step works, try building again:

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