how can I fix this error when trying to install fpc with homebrew

Question

im trying to install fpc via homebrew brew install fpc but I got an error

Warning: fpc 3.2.2_1 is already installed, it's just not linked. To link this version, run: brew link fpc

and when I use that command I got another error 

`Error: Could not symlink bin/bin2obj Target /usr/local/bin/bin2obj already exists. You may want to remove it: rm '/usr/local/bin/bin2obj'

To force the link and overwrite all conflicting files: brew link --overwrite fpc

To list all files that would be deleted: brew link --overwrite --dry-run fpc

`

I then used the command to force the link and overwrite all conflicting files but another error came out 

`

Error: Could not symlink share/doc/fpc-3.2.2/aspell/examples/example.pas /usr/local/share/doc/fpc-3.2.2/aspell/examples is not writable.`

i also used brew doctor but I couldn't  solve what it told me 

`

Warning: Unbrewed dylibs were found in /usr/local/lib. If you didn't put them there on purpose they could cause problems when building Homebrew formulae, and may need to be deleted.

Unexpected dylibs: /usr/local/lib/libpas2jslib.dylib

Warning: You have unlinked kegs in your Cellar. Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on those kegs to fail to run properly once built. Run brew link on these: fpc

`