charlie@charlie:~/Desktop/ns-allinone-3.36.1/ns-3.36.1$ ls
AUTHORS build-support CMakeLists.txt doc ns3 scratch testpy.supp VERSION
bindings CHANGES.md contrib examples README.md src utils
build cmake-cache CONTRIBUTING.md LICENSE RELEASE_NOTES.md test.py utils.py
charlie@charlie:~/Desktop/ns-allinone-3.36.1/ns-3.36.1$ ./waf
bash: ./waf: No such file or directory
Could someone help me out to understand why waf module is not installed in my directory?