ConcurrentDictionary was introduced with .NET 4 but it should be present under Mono 2.10. It builds fine with my stock 2.10.8.1 under Ubuntu and release notes suggest it was in Mono 2.8 already.

So 2 things I would also suggest off the top of my head.

1)  Simply sanity check, are you absolutely sure you're using mono 2.10?  What 
does mono --version output?

2) If everything should be okay, you could post a bigger snippet of the compile failure. I would want to check that it indicates you are building against the .NET 4 framework and not something earlier. "nant" posts the .net fw info explicitly. "xbuild" does not but it should be detectable via "/reference:/usr/lib/mono/4.0/System.dll" and similar.

On 03/04/14 00:50, Michael Emory Cerquoni wrote:
what about libmono*


On Wed, Apr 2, 2014 at 7:43 PM, Ken Hall <kjhal...@gmail.com 
<mailto:kjhal...@gmail.com>> wrote:

    Yep.____

    __ __

    mono-data-postgresql-2.10.8-5.fc20.x86_64____

    mono-extras-2.10.8-5.fc20.x86_64____

    mono-devel-2.10.8-5.fc20.x86_64____

    monodoc-devel-2.10.8-5.fc20.x86_64____

    mono-data-oracle-2.10.8-5.fc20.x86_64____

    mono-winfx-2.10.8-5.fc20.x86_64____

    mono-mvc-2.10.8-5.fc20.x86_64____

    monodoc-2.10.8-5.fc20.x86_64____

    mono-web-devel-2.10.8-5.fc20.x86_64____

    mono-data-sqlite-2.10.8-5.fc20.x86_64____

    mono-web-2.10.8-5.fc20.x86_64____

    mono-addins-0.6.2-8.fc20.x86_64____

    mono-nunit-devel-2.10.8-5.fc20.x86_64____

    mono-mvc-devel-2.10.8-5.fc20.x86_64____

    mono-core-2.10.8-5.fc20.x86_64____

    mono-winforms-2.10.8-5.fc20.x86_64____

    mono-wcf-2.10.8-5.fc20.x86_64____

    mono-nunit-2.10.8-5.fc20.x86_64____

    mono-locale-extras-2.10.8-5.fc20.x86_64____

    mono-data-2.10.8-5.fc20.x86_64____

    __ __

    __ __

    __ __

    *From:*opensim-users-boun...@lists.berlios.de 
<mailto:opensim-users-boun...@lists.berlios.de>
    [mailto:opensim-users-boun...@lists.berlios.de 
<mailto:opensim-users-boun...@lists.berlios.de>] *On Behalf Of
    *Michael Emory Cerquoni
    *Sent:* Wednesday, April 02, 2014 3:25 PM


    *To:* OpenSim Users Mailing List
    *Subject:* Re: [Opensim-users] Opensim compile error under Mono 2.10____

    __ __

    what about mono-devel and mono-extras are they installed too?____

    __ __

    On Wed, Apr 2, 2014 at 3:16 PM, Ken Hall <kjhal...@gmail.com 
<mailto:kjhal...@gmail.com>> wrote:____

        This is Fedora 20, using the packages from the distro.  There’s no 
“mono-complete”, but I installed all mono
        packages for x86_64.____

        ____

        7112ee0 from March 11 builds successfully, it’s only the latest level, 
6557eba that doesn’t.____

        ____

        Maybe I’ll wait for the next level and see if that corrects it.____

        ____

        ____

        *From:*opensim-users-boun...@lists.berlios.de 
<mailto:opensim-users-boun...@lists.berlios.de>
        [mailto:opensim-users-boun...@lists.berlios.de 
<mailto:opensim-users-boun...@lists.berlios.de>] *On Behalf Of
        *Michael Emory Cerquoni
        *Sent:* Wednesday, April 02, 2014 2:42 PM
        *To:* OpenSim Users Mailing List
        *Subject:* Re: [Opensim-users] Opensim compile error under Mono 2.10____

        ____

        Make sure you have mono-complete installed if your doing it from 
repository.____

        ____

        On Wed, Apr 2, 2014 at 2:22 PM, Marcus Llewellyn 
<marcus.llewel...@gmail.com
        <mailto:marcus.llewel...@gmail.com>> wrote:____

            I just grabbed opensim-6557eba.tar.gz from OSgrid's website, and 
compiled it under Mono 2.10.8.1 without a
            problem on Debian 7. Just for giggles, I also compiled it under 
Mono 3.2.8 successfully. Perhaps you're
            missing a dependency?____

            ____

            On Wed, Apr 2, 2014 at 12:28 PM, Ken Hall <kjhal...@gmail.com 
<mailto:kjhal...@gmail.com>> wrote:____

                Compiling the latest version (6557eba) from the OSGRID web site 
under Mono 2.10, I get the following:____

                ____

                [csc] 
/data/osgrid-build/opensim-6557eba/OpenSim/Framework/Util.cs(2032,24): error 
CS0246: The type or
                namespace name `ConcurrentDictionary' could not be found. Are 
you missing a using directive or an
                assembly reference?____

                                   [csc] Compilation failed: 1 error(s), 1 
warnings____

                ____

                Never had problems compiling before, nothing in Mantis.  Does 
this look like something changed, or a bug
                that I should report?  Wondering if anyone else has seen 
this.____

                ____

                Thanks____

                ____

                ____

                ____

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            ____


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