Mac Catalina x86: brew fails due to cmake dependency

[sudobinbash]

Setup on Mac (x86 catalina) fails due to a cmake dependency (despite having cmake installed in my machine):

% brew install cmake
==> Downloading https://cmake.org/files/LatestRelease/cmake-3.21.4-macos-universal.dmg
==> Installing Cask cmake...
🍺  cmake was successfully installed!
% brew install MisterTea/et/et

Warning: No available formula with the name "cmake" (dependency of mistertea/et/et).
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
Found a cask named "cmake" instead. Try
  brew install --cask cmake

I tried using --ignore-dependencies , but the setup is failing:

% brew install --ignore-dependencies MisterTea/et/et
Warning: `--ignore-dependencies` is an unsupported Homebrew developer flag!
Adjust your PATH to put any preferred versions of applications earlier in the
PATH rather than using this unsupported flag!

==> Downloading https://github.com/MisterTea/EternalTerminal/archive/et-v6.1.8.tar.gz
Already downloaded: /Users/abc/Library/Caches/Homebrew/downloads/a3a27ae31ad58c94906e7f7491baadeb40a4e0e6c26665390a69129bcb5637ba--EternalTerminal-et-v6.1.8.tar.gz
==> Installing et from mistertea/et
==> cmake . -DDISABLE_VCPKG:BOOL=ON
Last 15 lines from /Users/abc/Library/Logs/Homebrew/et/01.cmake:
2021-11-15 19:17:33 +0000

cmake
.
-DDISABLE_VCPKG:BOOL=ON
-DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/et/6.1.8_1
-DCMAKE_INSTALL_LIBDIR=lib
-DCMAKE_BUILD_TYPE=Release
-DCMAKE_FIND_FRAMEWORK=LAST
-DCMAKE_VERBOSE_MAKEFILE=ON
-Wno-dev
-DBUILD_TESTING=OFF
-DCMAKE_OSX_SYSROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk


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

 % 

The cmake version I'm running is 3.21.4 (installed via brew: brew install cmake).