C compiler cannot create executables. -- Revisited

[tang]

I came across this error after trying to compile several BlackBox tools. I found a post on this site to create symbolic links but I got this message for each link command listed:

[localhost:~/] root# ln -s /usr/bin/c++ /usr/bin/g++
ln: /usr/bin/g++: File exists

Whaddya guys think the problem is? Been searching for days but I can't seem to find a solution. Perhaps, you have a solution?