To check whether you have gcc installed type the following at a console command line:
gcc -vIf you have gcc compiler installed then it should return the version. Next you'll want to find out what directory it resides in by typing the following at the command line:
find / -name gcc If you find the directory where gcc is located the next thing to do is add it to your $PATH variable. This can be done by editing your .bash_profile file and concatenating the absolute path to where gcc is located to the PATH variable declaration.
Notes about .bash_profile: As you might know, but I'm not sure you do by your questioning; that the period (.) in front of any file means that file is hidden unless you use the -a option of the ls command. I prefer using ls -al so that the output is in list form. Also, I'm assuming you're using Bash shell for your console.
I hope this works or at least points you in the right direction.