brew install qt

 ~ $ brew install qt5
Updating Homebrew...
==> Downloading https://homebrew.bintray.com/bottles/qt-5.12.3.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/b6/b669ba7803986326f32e9fe5d2b7229e6ecd806517e8bf750ea4ec59fa8da45f?__gda__=exp=1561215887~hmac=0a33b435c9f633b3fd05f0d3b935cbc30ffa39343642ad5e6f6e5fcb774f
######################################################################## 100.0%
==> Pouring qt-5.12.3.mojave.bottle.tar.gz
==> Caveats
We agreed to the Qt open source license for you.
If this is unacceptable you should uninstall.

qt is keg-only, which means it was not symlinked into /usr/local,
because Qt 5 has CMake issues when linked.

If you need to have qt first in your PATH run:
  echo 'export PATH="/usr/local/opt/qt/bin:$PATH"' >> ~/.bash_profile

For compilers to find qt you may need to set:
  export LDFLAGS="-L/usr/local/opt/qt/lib"
  export CPPFLAGS="-I/usr/local/opt/qt/include"


==> qt
We agreed to the Qt open source license for you.
If this is unacceptable you should uninstall.

qt is keg-only, which means it was not symlinked into /usr/local,
because Qt 5 has CMake issues when linked.

If you need to have qt first in your PATH run:
  echo 'export PATH="/usr/local/opt/qt/bin:$PATH"' >> /Users/lyq/.bash_profile

For compilers to find qt you may need to set:
  export LDFLAGS="-L/usr/local/opt/qt/lib"
  export CPPFLAGS="-I/usr/local/opt/qt/include"

For pkg-config to find qt you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/qt/lib/pkgconfig"

==> ncurses
ncurses is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have ncurses first in your PATH run:
  echo 'export PATH="/usr/local/opt/ncurses/bin:$PATH"' >> /Users/lyq/.bash_profile

For compilers to find ncurses you may need to set:
  export LDFLAGS="-L/usr/local/opt/ncurses/lib"
  export CPPFLAGS="-I/usr/local/opt/ncurses/include"

For pkg-config to find ncurses you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/ncurses/lib/pkgconfig"

==> tmux
Example configuration has been installed to:
  /usr/local/opt/tmux/share/tmux

Bash completion has been installed to:
  /usr/local/etc/bash_completion.d