# Vtk 9.1.0 wants version 8.1.0 of FMT?

**URL:** <https://discourse.vtk.org/t/vtk-9-1-0-wants-version-8-1-0-of-fmt/7417>\
**Category:** Development\
**Created:** [December 16, 2021, 3:02pm UTC](https://discourse.vtk.org/t/vtk-9-1-0-wants-version-8-1-0-of-fmt/7417 "2021-12-16T15:02:57Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Michael\_Jackson](https://discourse.vtk.org/user_avatar/discourse.vtk.org/michael_jackson/32/61_2.png) [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Post date:** [December 16, 2021, 3:02pm UTC](https://discourse.vtk.org/t/vtk-9-1-0-wants-version-8-1-0-of-fmt/7417/1 "2021-12-16T15:02:57Z")

</div>

I was trying to build VTK version 9.1 using an external “fmt” library but I am getting a cmake configuration error where VTK wants version 8.1.0 of fmt but such a version does not exist according to the official GitHub repository. There is however a 8.0.1 version of fmt available? Is this a bug in VTK or is VTK using some unreleased version of FMT?

---

<div class="post-metadata">

**Author:** ![ben.boeckel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Post date:** [December 16, 2021, 3:53pm UTC](https://discourse.vtk.org/t/vtk-9-1-0-wants-version-8-1-0-of-fmt/7417/2 "2021-12-16T15:53:03Z")

</div>

We submitted a PR to `fmt` that has not yet been released. The [comment on the requirement](https://gitlab.kitware.com/vtk/vtk/-/blob/d4dc2a48bfda37f3f14e03551e09de80dfb674a0/ThirdParty/fmt/CMakeLists.txt#L9-11) has more details.