Install

Rationale :

Primary objective of this document is to keep a consize document of installing different Linux packages that I use. It is always wise to keep all the non-default version of packages in one master directory (eg. /home/softwares/packs/). We would also make the same parent directoy (eg. /home/softwares/) as a location to install these packs.

Install GCC/GFORTRAN/C++ compilers [CentOS, Ubuntu]:

Download the latest / required version of the compiler source from https://gcc.gnu.org/ , we consider the relavent source file to be <gcc-9.3.0.tar.gz>, one should change the name accordingly.
Go to terminal :

mv gcc-9.3.0.tar.gz /home/softwares/packs/

tar -zxvf gcc-9.3.0.tar.gz

cd gcc-9.3.0/

./contrib/download_prerequisites ##[Note: this downloads all the required packs and keep them in proper places, a must do for old machines]

./configure --prefix=/home/softwares/--enable-languages=c,c++,fortran --disable-multilib ##[Note: there are other flags also, but this should do for now]

make -j16 ##[Note: -j16 flag, asks for a parallel compilation on 16 processors]

make install

Make a shell file to export proper path, instead of adding them to ~/.bashrc, if you do this, you can use system's default versions also when required.
- vi /home/softwares/RC_gnu.sh

#! /bin/bash

export PATH=/home/softwares/bin:/home/softwares/usr/bin:$PATH

export LD_LIBRARY_PATH=/home/softwares/lib64:/home/softwares/lib:/home/softwares/usr/lib64:/home/softwares/usr/lib:$LD_LIBRARY_PATH

chmod +x /home/softwares/RC_gnu.sh
source /home/softwares/RC_gnu.sh ##[Note: One needs to do this everytime a new terminal is opened to use this version of compilers]

4. Check Gfortran version:

gfortran -v ##[Note: this should return required version of compiler, different from system default. ]

Install Python3.X [CentOS]:

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