# Extend SlicerRT

**URL:** <https://discourse.slicer.org/t/extend-slicerrt/12569>\
**Category:** Support\
**Created:** [July 16, 2020, 6:52am UTC](https://discourse.slicer.org/t/extend-slicerrt/12569 "2020-07-16T06:52:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![toyama](https://avatars.discourse-cdn.com/v4/letter/t/82dd89/32.png) [@toyama](https://discourse.slicer.org/u/toyama)\
**Post date:** [July 16, 2020, 6:52am UTC](https://discourse.slicer.org/t/extend-slicerrt/12569/1 "2020-07-16T06:52:18Z")

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![3DSlicer1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/2/c26d5b912e6884fcdf586f9bcdfcd0b798d64812.png)  
↑I want to do CMake to extend SlicerRT, but I cannot specify “where is source code” in the downloaded file. What should I specify for “where is source code”?  
Please answer.  
 ![2](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/5/05e4b8b936423044fca2638e5e4f88e06ffad1c8.png)  
 ![3](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/c/1c68eeec0f287ee53459785d0e631b9ed1f6a645.png)

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [July 16, 2020, 9:28am UTC](https://discourse.slicer.org/t/extend-slicerrt/12569/2 "2020-07-16T09:28:46Z")

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> **[SlicerRt/SlicerRT](https://github.com/SlicerRt/SlicerRT/wiki/SlicerRt-developers-page)**
>
> Open-source toolkit for radiation therapy research, an extension of 3D Slicer. Features include DICOM-RT import/export, dose volume histogram, dose accumulation, external beam planning (TPS), struc...