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I was trying to install the software quicknet from a tar.gz file. After running ./configure, when I tried running make, it showed the following error:

g++ -I. -I.   -c QN_args.cc
/bin/bash: g++: command not found
make: *** [QN_args.o] Error 127

I have already installed the gcc compiler.

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You need the g++ compiler, not gcc, so install the g++ package, and maybe build-essential for any needed headers:

sudo apt-get install g++

And if necessary (probably not for this package):

sudo apt-get install build-essential

You should read the README file(s), then the INSTALL file and follow the instructions. They usually boil down to running configure:

./configure

Then running make:

make

Then, if you want to install the programs in a system area, run:

sudo make install

The configure step should search out the necessary parts (g++) and complain and stop if necessary parts are not found. It builds the Makefile from the information about your system.

I had no issues with the downloaded package, but then again, I do have the build-essential package installed for what I do. g++ gets installed into /usr/bin, which should be a normal part of your PATH.

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    i have installed g++ package but still it shows same problem. if you want the link for the software i am trying to install then let me know thank you
    – Jasmeen Patel
    Feb 10, 2015 at 13:15
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    @JasmeenPatel ubfan1's instructions typically work for problems manifesting as you had described. So I think this question and answer are helping other people...but it's too bad this didn't enable you to fix your problem! You asked this over three years ago so my guess is that you either solved the problem or don't have quite the same problem compiling the software as you did back then. But if you are still looking for a solution to this same problem, then I definitely recommend that you edit your question with details on every step you took including where you obtained the .tar.gz file.
    – Eliah Kagan
    Apr 19, 2018 at 12:20

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