結論
環境変数 LIBRARY_PATH
に $(brew --prefix zstd)/lib
を追加する。
具体的な実行例
$ LIBRARY_PATH="$LIBRARY_PATH:$(brew --prefix zstd)/lib" bundle install
エラーメッセージの例
(前略) compiling client.c compiling infile.c compiling mysql2_ext.c compiling result.c compiling statement.c linking shared-object mysql2/mysql2.bundle ld: warning: -multiply_defined is obsolete ld: library 'zstd' not found clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [mysql2.bundle] Error 1 make failed, exit code 2 (後略)