# Can't build ODEInterface on MacOS, "ld: library not found for -ldylib1.o"

**URL:** <https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634>\
**Category:** General Usage\
**Tags:** question, package, diffeq, build\
**Created:** [October 8, 2019, 4:18am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634 "2019-10-08T04:18:28Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![minkailin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/minkailin/32/10674_2.png) [@minkailin](https://discourse.julialang.org/u/minkailin)\
**Post date:** [October 8, 2019, 4:18am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/1 "2019-10-08T04:18:29Z")

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I’m trying to use ODEInterface and ODEInterfaceDiffEq but encountered the following problem. I’m not sure what the issue is or how to resolve it? I am using Julia 1.0.3 on macOS Mojave 10.14.6.

 ![55](https://global.discourse-cdn.com/julialang/original/3X/5/0/50ce3366c4b6269e1293df05b7482a0abf0a133a.png)

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [October 8, 2019, 7:06am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/2 "2019-10-08T07:06:38Z")

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Have you installed XCode and gfortran?

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**Author:** ![minkailin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/minkailin/32/10674_2.png) [@minkailin](https://discourse.julialang.org/u/minkailin)\
**Post date:** [October 9, 2019, 5:44am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/3 "2019-10-09T05:44:57Z")

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Yes, I have xcode 11.1 (11A1027) and gfortran installed. I also opened xcode once, which prompts it to install additional components, although it didn’t show details.

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**Author:** ![h.smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/h.smith/32/32263_2.png) [@h.smith](https://discourse.julialang.org/u/h.smith)\
**Post date:** [October 9, 2019, 2:09pm UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/4 "2019-10-09T14:09:51Z")

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Not sure at all, but it would be worth downloading those “additional components” - they usually include command line interfaces etc (AFAIK) and are a good idea to have in general.

HTH

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**Author:** ![minkailin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/minkailin/32/10674_2.png) [@minkailin](https://discourse.julialang.org/u/minkailin)\
**Post date:** [October 9, 2019, 2:17pm UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/5 "2019-10-09T14:17:48Z")

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Yes, when I opened xcode it asks to download and install those additional components, which I agreed to. Still get the same error when building ODEInterface though.

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**Author:** ![h.smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/h.smith/32/32263_2.png) [@h.smith](https://discourse.julialang.org/u/h.smith)\
**Post date:** [October 9, 2019, 2:27pm UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/6 "2019-10-09T14:27:38Z")

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OK that was good to do. Sorry I can’t offer more help on this… Good luck though…

HS

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<div class="post-metadata">

**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [October 11, 2019, 1:22am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/7 "2019-10-11T01:22:14Z")

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Open an issue on ODEInterface.jl.

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**Author:** ![minkailin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/minkailin/32/10674_2.png) [@minkailin](https://discourse.julialang.org/u/minkailin)\
**Post date:** [October 11, 2019, 8:55am UTC](https://discourse.julialang.org/t/cant-build-odeinterface-on-macos-ld-library-not-found-for-ldylib1-o/29634/8 "2019-10-11T08:55:12Z")

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Solved by updating gfortran to 8.2 for Mojave ([https://github.com/fxcoudert/gfortran-for-macOS/releases](https://github.com/fxcoudert/gfortran-for-macOS/releases)).