2nd attempt

ubuntu@ubuntu:~$ cd ffmpeg
ubuntu@ubuntu:~/ffmpeg$ sudo make distclean, ./configure and build it again
Makefile:2: config.mak: No such file or directory
Makefile:49: /common.mak: No such file or directory
Makefile:92: /libavutil/Makefile: No such file or directory
Makefile:92: /library.mak: No such file or directory
Makefile:179: /doc/Makefile: No such file or directory
Makefile:180: /tests/Makefile: No such file or directory
make: *** No rule to make target `/tests/Makefile'.  Stop.
ubuntu@ubuntu:~/ffmpeg$