brew remove inkscape : Error: Calling needs :cxx11 is disabled

Question

How can I fix the problem below ?

$ brew update && brew upgrade
Already up-to-date.
Error: Calling needs :cxx11 is disabled! There is no replacement.
Please report this to the weikengchen/caskformula tap:
  /usr/local/Homebrew/Library/Taps/weikengchen/homebrew-caskformula/Formula/inkscape.rb:31

If reporting this issue please do so at (not Homebrew/brew or Homebrew/core):
  https://github.com/weikengchen/homebrew-caskformula/issues

Answer 1

Both the taps caskformula/caskformula and weikengchen/caskformula (possibly others?) seem to cause this problem. To list your current taps, run

brew tap

Now untap the suspicious repository:

brew untap caskformula/caskformula # This worked for me

Run brew doctor to check for issues after removing caskformula. If there are issues, follow the recommendations.

Finally update repositories and upgrade software:

brew update

brew upgrade

Some more info in this issue on github:

https://github.com/caskformula/homebrew-caskformula/issues/74

Answer 2

This finally fixed my problem:

brew untap weikengchen/caskformula
brew update && brew upgrade