http://userguide.icu-project.org/howtouseicu (as of right now) deemphasizes icu-config over pkg-config. Consider deprecating icu-config, maybe making it a thin wrapper that just calls pkg-config
For the record, as of ICU 63.1 you can use {{ --disable-icu-config }} to disable icu-config, or {{ --enable-icu-config }} to enable it (which is the default). If you need icu-config, please start using {{ --enable-icu-config }} so that we can change the default to 'disable' in the future.
(Using --enable-icu-config on releases prior to 63.1 is safe, it only produces a warning about an unrecognized option.)
http://userguide.icu-project.org/howtouseicu (as of right now) deemphasizes icu-config over pkg-config. Consider deprecating icu-config, maybe making it a thin wrapper that just calls pkg-config