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update installation page

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docs/the_nimbus_book/src/install.md
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# Installation
The Beacon chain can run on Linux, macOS, Windows, and Android. At the moment, Nimbus has to be built from source.
The Nimbus beacon chain can run on Linux, macOS, Windows, and Android. At the moment, Nimbus has to be built from source.
## Time
The beacon chain relies on your computer having the correct time set, down to at most 0.5 seconds.
The beacon chain relies on your computer having the correct time set (plus or minus 0.5 seconds).
We recommended you run a high quality time service on your computer such as:
* GPS
* NTS (network time security, IETF draft)
* Roughtime (google)
* NTS (network time security, [IETF draft](https://tools.ietf.org/html/draft-ietf-ntp-using-nts-for-ntp-19))
* [Roughtime](https://roughtime.googlesource.com/roughtime) (google)
As a minimum, you should run an NTP client on the server.
At a minimum, you should run an NTP client on the server.
If that makes no sense to you, don't worry. For testnets, just making sure your computer is set at the correct time should be fine.
If that sounds like latin to you, don't worry. For testnet purposes, you should be fine as long as your computer is set to the correct time.
## External Dependencies
- Developer tools (C compiler, Make, Bash, Git)
- PCRE
- [PCRE](https://www.pcre.org/)
Nim is not an external dependency, Nimbus will build its own local copy.
Nimbus will build its own local copy of Nim, so Nim is not an external dependency,
## Linux
On common Linux distributions the dependencies can be installed with:
On common Linux distributions the dependencies can be installed with
```sh
# Debian and Ubuntu
@ -49,15 +49,15 @@ brew install pcre cmake
### Windows
You can install the developer tools by following the instruction in our [Windows dev environment section](./advanced.md#windows-dev-environment).
It also provides a downloading script for prebuilt PCRE.
We also provide a downloading script for prebuilt PCRE.
### Android
- Install the [Termux](https://termux.com) app from FDroid or the Google Play store
- Install a [PRoot](https://wiki.termux.com/wiki/PRoot) of your choice following the instructions for your preferred distribution.
Note, the Ubuntu PRoot is known to contain all Nimbus prerequisites compiled on Arm64 architecture (common architecture for Android devices).
Note, the Ubuntu PRoot is known to contain all Nimbus prerequisites compiled on Arm64 architecture (the most common architecture for Android devices).
_Assuming Ubuntu PRoot is used_
Assuming you use Ubuntu PRoot
```sh
apt install build-essential git libpcre3-dev
@ -65,4 +65,4 @@ apt install build-essential git libpcre3-dev
## Next steps
Once you've installed the prerequisites, you're ready to move on to [running a validator on Medalla](./medalla.md).
You're now ready to move on to [running a validator on Medalla](./medalla.md).