Incorporated suggestions from lcompilers#2537

Moved global package installations to conda environment.

doc/src/installation.md

@@ -12,16 +12,10 @@ Follow the steps below to install and run LPython on Linux, Windows or macOS.
 
 - ### Set up your system
  - Linux
- - Make sure you have `g++` and `cmake` installed. If not, install them using the below command:
+ - Run the following command to install some global build dependencies:
 
   ```bash
-  sudo apt-get install g++ cmake
-  ```
-
- - Run the following command to install the build dependencies:
-
-  ```bash
-  sudo apt-get install binutils-dev build-essential zlib1g-dev bison re2c flex
+  sudo apt-get install build-essential binutils-dev clang zlib1g-dev
   ```
  - Windows
  - Download and install [Microsoft Visual Studio Community](https://visualstudio.microsoft.com/downloads/) for free.