How to install Mercury lang?

Installing Mercury can be an intimidating process. Here are the steps I followed to get Mercury lang up and running.

Download the latest ROTD. This tutorial uses a ROTD dated 2018-04-30, you should replace this date throughout.

Uncompress the source archive

$ tar -xzf mercury-srcdist-rotd-2018-04-30.tar.gz

Configure the installation to use only a few grades. This will save you a ton of compile time. Later if you decide you need more advanced features you can compile additional grades.
```
$ cd mercury-srcdist-rotd-2018-04-30

$ sudo apt-get install build-essential flex bison

$ ./configure --disable-most-grades
```
At this point you may be asked to install additional dependencies. Install the dependencies and keep running ./configure until it succeeds.
Build the project
```
$ make
```
Install the project
```
$ make install
```

Add mercury to your PATHs. Add the following lines to your ~/.bashrc (~/.bash_profile on a mac).

export PATH="/usr/local/mercury-rotd-2018-04-30/bin:$PATH"
export MANPATH="/usr/local/mercury-rotd-2018-04-30/man:$MANPATH"
export INFOPATH="/usr/local/mercury-rotd-2018-04-30/info:$INFOPATH"

Close the terminal and open a new one. Or $ source ~/.bashrc
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