brew install icu4c运行之后的提示

brew install icu4c
运行之后，提示：

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/icu4c/bin:$PATH"' >> ~/.bash_profile
  echo 'export PATH="/usr/local/opt/icu4c/sbin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/icu4c/lib
    CPPFLAGS: -I/usr/local/opt/icu4c/include
For pkg-config to find this software you may need to set:
    PKG_CONFIG_PATH: /usr/local/opt/icu4c/lib/pkgconfig