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Update "how to install on Linux" instructions #3598

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Sep 8, 2020
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Update "how to install on Linux" instructions #3598

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38 changes: 34 additions & 4 deletions INSTALL.md
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Expand Up @@ -14,20 +14,50 @@ Starting with the next ponyc release, you'll also be able to download prebuilt p

Prebuilt Linux packages are available via [ponyup](https://github.com/ponylang/ponyup) for Glibc and musl libc based Linux distribution. You can install nightly builds as well as official releases using ponyup.
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We should specify that we only have prebuilt images for AMD64 at this time

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Can you make a suggest a change for that and I'll incorporate?

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Actually that feels like a different PR, agreed? As it applies in general across all platforms.

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I guess you're correct, since macOS and Windows will likely have more widespread ARM support soon.


To install the most recent ponyc:
### Select your Linux platform

```bash
ponyup platform PLATFORM
```

where `PLATFORM` is from the table below

Distribution | PLATFORM String
--- | ---
Alpine | musl
CentOS 8 | centos8
Linux Mint 19.3 | ubuntu18.04
Ubuntu 18.04 | ubuntu18.04
Ubuntu 20.04 | ubuntu20.04

N.B. If you platform isn't listed, skip to the next section and ponyup will install, as appropriate a Glibc or musl libc build of ponyc.

### Install the latest release

```bash

ponyup update ponyc release
```

Additional requirements:
### Additional requirements

All ponyc Linux installations need to have a C compiler such as clang installed. Compilers other than clang might work, but clang is the officially supported C compiler. The following distributions have additional requirements:

Distribution | Requires
--- | ---
alpine | libexecinfo
fedora | libatomic
Alpine | libexecinfo
CentOS | libatomic
Fedora | libatomic

### Troubleshooting Glibc compatibility

Most Linux distributions are based on Glibc and all software for them must use the same version of Glibc. You might see an error like the following when trying to use ponyc:

```console
ponyc: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by ponyc)
```

If you get that error, it means that the Glibc we compiled ponyc with isn't compatible with your distribution. If your distribution is a long term support release, please [open an issue](https://github.com/ponylang/ponyc/issues) and we'll work towards adding prebuilt images for your distribution. Otherwise, you'll have to [build ponyc from source](BUILD.md).

## macOS

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