SU Error - su: not running setuid

If this error occures while you try to su, it means that you need to set SUID bit to su binary like below:

 So above commands do:

1. ls -l `which su` - lists su binary 

2. chmod u+s `which su` - adds SUID bit to su binary

3 exactly like 1.

4. su to another user ( andrei in this case)

4. su to root from a normal user. See that the error does not occure any more.

notes: instead of `which su` you could use directly /path/to/su/binary if you know it, and you can use `which su` and it'll work on both Linux & FreeBSD.

This error occured  after a buildworld. I  suspect that because of  file flags I use.

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