# Installation issue on Mac osx-64 (libgcc-ng)

**URL:** <https://forum.anaconda.com/t/installation-issue-on-mac-osx-64-libgcc-ng/47053>\
**Category:** How do I...?\
**Created:** [December 7, 2022, 4:08pm UTC](https://forum.anaconda.com/t/installation-issue-on-mac-osx-64-libgcc-ng/47053 "2022-12-07T16:08:29Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![sebastien.moretti](https://dub1.discourse-cdn.com/anaconda/user_avatar/forum.anaconda.com/sebastien.moretti/32/2709_2.png) [@sebastien.moretti](https://forum.anaconda.com/u/sebastien.moretti)\
**Post date:** [December 7, 2022, 4:08pm UTC](https://forum.anaconda.com/t/installation-issue-on-mac-osx-64-libgcc-ng/47053/1 "2022-12-07T16:08:29Z")

</div>

Hi

I have a package ([Chipseq :: Anaconda.org](https://anaconda.org/sibswiss/chipseq)) that requires perl, perl-math-round, grep and gawk to run.  
All requirements exist for linux-64 and osx-64 (in conda-forge and/or bioconda).

Nevertheless the installation fails on osx-64:

```auto
ResolvePackageNotFound:
 - libgcc-ng[version='>=11.2.0']

```

libgcc-ng is not available for osx-64 but I don’t know why the installation fails on osx-64 although all requirements are available for osx-64.

Thanks

No problem on linux-64  
I install the package with this command within an empty environment, and the last version of miniconda:  
`conda install -c sibswiss -c bioconda chipseq`