# Compatibility problem when installing julia packages

**URL:** <https://discourse.julialang.org/t/compatibility-problem-when-installing-julia-packages/41423>\
**Category:** General Usage\
**Created:** [June 15, 2020, 8:02am UTC](https://discourse.julialang.org/t/compatibility-problem-when-installing-julia-packages/41423 "2020-06-15T08:02:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![hendri54](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/hendri54/32/9621_2.png) [@hendri54](https://discourse.julialang.org/u/hendri54)\
**Post date:** [June 15, 2020, 11:33am UTC](https://discourse.julialang.org/t/compatibility-problem-when-installing-julia-packages/41423/2 "2020-06-15T11:33:37Z")

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There are a couple of related threads on discourse:

> [@Version of a new package (\["master"\] has no known version)](https://discourse.julialang.org/t/version-of-a-new-package-master-has-no-known-version/30731):
>
> I have two packages under development, the second, X3872.jl, depends on the first ThreeBodyDecay.jl. While there is no specific requirement for the version of the first package, the Pkg system cannot resolve the dependence. (v1.1) pkg\> dev X3872 [Info: Path `.julia\dev\X3872` exists and looks like the correct package, using existing path Resolving package versions... ERROR: Unsatisfiable requirements detected for package ThreeBodyDecay [e6563dab]: ThreeBodyDecay [e6563dab] log: ├─ThreeB…

> [@Package Manager resolve complaining of "Unsatisfiable requirements" due to "no known versions"](https://discourse.julialang.org/t/package-manager-resolve-complaining-of-unsatisfiable-requirements-due-to-no-known-versions/23778):
>
> I frequently get the following error with packages that I’m developing. I usually manage to resolve it but without any understanding or repeatability. How do I tell julia about versions for a package? Am I supposed to tag it in git or some such? I also didn’t see anything about this in the package manager documentation. Resolving package versions… ERROR: Unsatisfiable requirements detected for package Models [d5623a7a]: Models [d5623a7a] log: ├─Models [d5623a7a] has no known versions! └…

I think Kristoffer Carlsson has likely answered your question there.

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