macOS build error (readline)

[irudoy]

MacOS 10.13.2

[ 63%] Building CXX object CMakeFiles/tg_cli.dir/td/telegram/cli.cpp.o
/.../td/td/telegram/cli.cpp:99:3: error: use of undeclared identifier 'rl_replace_line'
  rl_replace_line("", 0);
  ^
/.../td/td/telegram/cli.cpp:105:3: error: use of undeclared identifier 'rl_replace_line'
  rl_replace_line(saved_line.c_str(), 0);
  ^
/.../td/td/telegram/cli.cpp:586:5: error: use of undeclared identifier 'rl_free'
    rl_free(line);
    ^

$ brew info readline

readline: stable 7.0.3 (bottled) [keg-only]
Library for command-line editing
https://tiswww.case.edu/php/chet/readline/rltop.html
/usr/local/Cellar/readline/7.0.3_1 (46 files, 1.5MB)
  Poured from bottle on 2017-03-14 at 11:47:40
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/readline.rb
==> Caveats
This formula is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only..

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/readline/lib
    CPPFLAGS: -I/usr/local/opt/readline/include

[irudoy]

$ brew link --force readline doesn't help

[levlam]

Could you check that CMake has found GNU Readline installed via brew and not a libedit readline-like interface shipped by default in Mac OS?
If GNU Readline was installed after first cmake run, then CMakeCache should be purged in order to find the correct library.

[irudoy]

The solution:

brew link --force readline
rm -rf build && mkdir build && cd build
cmake -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl/ ..
cmake --build .
cmake --build . --target install
brew unlink readline

Perhaps it's worth adding this to the readme