I had the same problem with watchman.
brew install watchman
response for :
==> Installing dependencies for watchman: automake, pcre
==> Installing watchman dependency: automake
==> Downloading https://ftp.gnu.org/gnu/automake/automake-1.16.1.tar.xz Already
downloaded:
/Users/piccolo/Library/Caches/Homebrew/automake-1.16.1.tar.xz
==> Downloading https://git.savannah.gnu.org/cgit/automake.git/patch/?id=a348d83
Already downloaded:
/Users/piccolo/Library/Caches/Homebrew/automake--patch-7a57ca2b91f7f3c0b168cf5ffbc8a1b2168f3886bcadcc15412281472dace3ce.git
Error: SHA256 mismatch Expected:
7a57ca2b91f7f3c0b168cf5ffbc8a1b2168f3886bcadcc15412281472dace3ce
Actual:
c048ce853eef073a5dfce34fcf9af786e8525e384e01dbbf4e6066623985d4c7
Archive:
/Users/piccolo/Library/Caches/Homebrew/automake--patch-7a57ca2b91f7f3c0b168cf5ffbc8a1b2168f3886bcadcc15412281472dace3ce.git
To retry an incomplete download, remove the file above.
then I did this:
brew uninstall automake
brew cleanup
brew update
brew install watchman
Then it worked.