How to uninstall pre-installed previous version and install new

[Kyrill Tkachov]

On 06/08/14 11:11, Syed Ahsan Ali Bokhari wrote:
> I have set following paths in .bashrc to correspond to the latest
> installation of gcc
> export PATH=$PATH:/opt/gcc-4.9.1/bin
> export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/gcc-4.9.1/lib:/opt/gcc-4.9.1/lib64
>
> but still on run time the previous binaries/libraries are being found
>
> [rcm@rcm ~]$ which gcc
> /usr/bin/gcc
>
> How to handle this?

PATH is usually read left to right, so you'd want to add your new path 
to the beginning like so:

export PATH=/opt/gcc-4.9.1/bin:$PATH

Kyrill


> On Wed, Aug 6, 2014 at 8:16 AM, Syed Ahsan Ali Bokhari
> <ahsan.pmd@gmail.com> wrote:
>> Well explained Jonathan
>> Thanks
>>
>> On Tue, Aug 5, 2014 at 10:10 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
>>> On 5 August 2014 17:54, Syed Ahsan Ali Bokhari wrote:
>>>> Yes I did that before, I removed the gcc and when I tried to build a
>>>> new gcc from source it crashed complaining that no C compiler is
>>>> present. Isn't it weird that installation of C compiler needs C
>>>> compiler as a pre-requisite.?
>>> You don't need a compiler to install a C compiler, you need a compiler
>>> to *compile* a C compiler, just like you need a compiler to compile
>>> any program.
>>>
>>> If you just want to install gcc you use 'yum' or 'rpm' to do that,
>>> instead of compiling it yourself.
>>>
>>> If you want to compile gcc, obviously you need a compiler of some kind.
>>>
>>> It might seem weird but it's not, it's quite normal.
>>> http://en.wikipedia.org/wiki/Bootstrapping_%28compilers%29
>>
>>
>> --
>>   Syed Ahsan Ali Bokhari
>>   Electronic Engineer
>>   Research & Development Division
>>   Pakistan Meteorological Department H-8/2, Islamabad.
>>   Phone # off +92519250361
>>   Cell # +923155145014
>>   Fax # +92519250368
>>   www.pmd.gov.pk
>
>