Error while installing ns3-dev ( 3.36.1)

[Divyasheel]

Greetings everyone,

I start by configuring as:
./ns3 configure --enable-examples --enable-tests -d optimized

and then :

./ns3 install 

but this installation stops with an error message -
➤ ./ns3 install
[0/2] Re-checking globbed directories...
[1858/1859] Install the project...
-- Install configuration: "release"
CMake Error at cmake_install.cmake:46 (file):
  file cannot create directory: /usr/local/lib/pkgconfig.  Maybe need
  administrative privileges.


FAILED: CMakeFiles/install.util
cd /mnt/Store/Project-summer/ns-3-dev/cmake-cache && /usr/bin/cmake -P cmake_install.cmake
ninja: build stopped: subcommand failed.
Finished executing the following commands:
cd cmake-cache; cmake --build . -j 15 --target install ; cd ..

Can someone help me with this, I have tried almost all the online resources but there seems to be no clear documentation on how to build ns3-dev.

[Gabriel Ferreira]

The 3 commands you're most likely to use are 

ns3 configure

ns3 build

ns3 run

They're all mentioned in the tutorial. 

https://www.nsnam.org/docs/release/3.36/tutorial/html/getting-started.html#building-with-cmake

These are the exact same commands as you would find 

in any IDE, which are also shown below in the tutorial. 

`ns3 install` in only used in very specific scenarios.

The only reason it exists is to test for 

packaging and redistribution. 

And it is failing to install because /usr/local is protected. 

You would need to run with sudo to install it there.

Since the installation didn't proceed, I guess everything is working as expected.