brew install gdb

bonjour
j'ai un message d'erreur :

Code:

1
2
3
4
5
6
7
8
9
10
11
12
> brew install gdb
Error: No available formula for gdb 
Searching formulae...
cgdb   gdbm   pgdbf
Searching taps...
Warning: Failed to search tap: Homebrew/x11. Please run `brew update`
Warning: Failed to search tap: Homebrew/completions. Please run `brew update`
Warning: Failed to search tap: Homebrew/dupes. Please run `brew update`
Warning: Failed to search tap: Homebrew/games. Please run `brew update`
Warning: Failed to search tap: Homebrew/binary. Please run `brew update`
Warning: Failed to search tap: Homebrew/tex. Please run `brew update`
Caskroom/cask/macgdbp

et quand je fais, ainsi qu'il me le demande, l'update, ça ne marche pas non plus :

Code:

1
2
3
4
5
6
7
8
9
>brew update
warning: unable to unlink '.gitignore': Permission denied
warning: unable to unlink '.yardopts': Permission denied
warning: unable to unlink 'CODEOFCONDUCT.md': Permission denied
warning: unable to unlink 'CONTRIBUTING.md': Permission denied
warning: unable to unlink 'LICENSE.txt': Permission denied
warning: unable to unlink 'SUPPORTERS.md': Permission denied
error: unable to unlink old 'README.md': Permission denied
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master

et si je mets un sudo c'est pareil :

Code:

1
2
>sudo brew update
sudo: brew: command not found

Auriez vous une idée pour me dépanner ?

Je pourrais aussi isntaller linux sous virtual box mais je n'y arrive pas

ps je suis sous os X.10.14.5