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Home/ Questions/Q 7618379
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T03:23:20+00:00 2026-05-31T03:23:20+00:00

I built mono-2.10.2 from source and installed the fsharp packages from http://fsxplat.codeplex.com/ . But

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I built mono-2.10.2 from source and installed the fsharp packages from http://fsxplat.codeplex.com/. But I have this program which runs without error on Windows but not on Linux/Mono. It complains about the following error:

error FS0039: The value, onstructor, namespace or type 'Parallel' is not defined

The parallel extensions seem to be still missing.

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  1. Editorial Team
    Editorial Team
    2026-05-31T03:23:22+00:00Added an answer on May 31, 2026 at 3:23 am

    In principle, no.

    I have installed Mono 2.10.4 package release which includes F# package by default. Parallel extensions are working fine so I can use Array.Parallel.map.

    In your case, my guess is that fsharp package is outdated and doesn’t include parallel extensions. You should install F# from source by using the up-to-date and Mono-friendly version in github. A detailed instruction of doing so could be found here.

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