# Installation Error of MRtrix3Tissue

**URL:** <https://community.mrtrix.org/t/installation-error-of-mrtrix3tissue/5233>\
**Category:** Uncategorized\
**Created:** [September 28, 2021, 9:51am UTC](https://community.mrtrix.org/t/installation-error-of-mrtrix3tissue/5233 "2021-09-28T09:51:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Suzan\_Park](https://community.mrtrix.org/user_avatar/community.mrtrix.org/suzan_park/32/3505_2.png) [@Suzan\_Park](https://community.mrtrix.org/u/Suzan_Park)\
**Post date:** [September 28, 2021, 9:51am UTC](https://community.mrtrix.org/t/installation-error-of-mrtrix3tissue/5233/1 "2021-09-28T09:51:55Z")

</div>

Dear MRtrix experts,

Hi, hope you’re having a nice day.

I’ve confronted some errors installing MRtrix3Tissue while following the ‘Quick Install’ Guide ([[Install and update | MRtrix3Tissue](https://3tissue.github.io/doc/install/)]) - i ran this:

> ./build

and got several blocks of these.

Error looks like the following:

> ERROR: ( 26/506) [CC] tmp/core/formats/xds.o
> 
> clang++ -c -std=c++11 -DMRTRIX\_BUILD\_TYPE=“release version” -DMRTRIX\_MACOSX -fPIC -mmacosx-version-min=11.2 -DMRTRIX\_WORD64 -Wall -O3 -DNDEBUG -Isrc -I./core -Icmd -idirafter /usr/local/Cellar/eigen/3.4.0/include/eigen3 -DEIGEN\_DONT\_PARALLELIZE core/formats/xds.cpp -o tmp/core/formats/xds.o
> 
> failed with output
> 
> In file included from core/formats/xds.cpp:17:  
> In file included from ./core/file/ofstream.h:24:  
> ./core/types.h:326:9: error: redefinition of ‘Vector3’ as different kind of symbol  
> using Vector3 = Matrix\<MR::default\_type, 3, 1\>;  
> ^  
> /usr/local/Cellar/eigen/3.4.0/include/eigen3/Eigen/src/Core/Matrix.h:541:1: note: previous definition is here  
> EIGEN\_MAKE\_TYPEDEFS(3, 3)  
> ^  
> /usr/local/Cellar/eigen/3.4.0/include/eigen3/Eigen/src/Core/Matrix.h:523:67: note: expanded from macro ‘EIGEN\_MAKE\_TYPEDEFS’  
> template   
> :…skipping…
> 
> ERROR: ( 26/506) [CC] tmp/core/formats/xds.o
> 
> clang++ -c -std=c++11 -DMRTRIX\_BUILD\_TYPE=“release version” -DMRTRIX\_MACOSX -fPIC -mmacosx-version-min=11.2 -DMRTRIX\_WORD64 -Wall -O3 -DNDEBUG -Isrc -I./core -Icmd -idirafter /usr/local/Cellar/eigen/3.4.0/include/eigen3 -DEIGEN\_DONT\_PARALLELIZE core/formats/xds.cpp -o tmp/core/formats/xds.o
> 
> failed with output
> 
> In file included from core/formats/xds.cpp:17:  
> In file included from ./core/file/ofstream.h:24:  
> ./core/types.h:326:9: error: redefinition of ‘Vector3’ as different kind of symbol  
> using Vector3 = Matrix\<MR::default\_type, 3, 1\>;  
> ^  
> /usr/local/Cellar/eigen/3.4.0/include/eigen3/Eigen/src/Core/Matrix.h:541:1: note: previous definition is here  
> EIGEN\_MAKE\_TYPEDEFS(3, 3)  
> ^  
> /usr/local/Cellar/eigen/3.4.0/include/eigen3/Eigen/src/Core/Matrix.h:523:67: note: expanded from macro ‘EIGEN\_MAKE\_TYPEDEFS’  
> template   
> ^  
> In file included from core/formats/xds.cpp:17:

I’ve also tried downloading MRtrix3Tissue-3Tissue\_v5.2.9.zip, and configuration went fine - but again, when I tried to run the ‘build’ code, I got the following error:

> no “cmd” folder - unable to determine default targets

although I see the “cmd” folder.

What would the problem be?  
Thank you for your help in advance, have a nice day.

Best regards,  
Sujin

---

<div class="post-metadata">

**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:** [September 28, 2021, 10:00am UTC](https://community.mrtrix.org/t/installation-error-of-mrtrix3tissue/5233/2 "2021-09-28T10:00:13Z")

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Hi Sujin,

This error relates to conflicts with the latest version of [Eigen](https://eigen.tuxfamily.org/) (version 3.4) – [more details on this issue](https://github.com/MRtrix3/mrtrix3/pull/2368). We have recently merged the fix for this to our `master` branch, but that’s not what you’re using here…

Unfortunately, the software you’re trying to install is an independent project, forked from MRtrix3 some time ago. As such, you should probably [contact the maintainers of that project](https://3tissue.github.io/feedback-support.html) to get help with this particular issue.

All the best,  
Donald