binutilsを消して解決
$ rbenv install 2.7.0 Downloading openssl-1.1.1d.tar.gz... -> https://dqw8nmjcqpjn7.cloudfront.net/1e3a91bc1f9dfce01af26026f856e064eab4c8ee0a8f457b5ae30b40b8b711f2 Installing openssl-1.1.1d... BUILD FAILED (OS X 10.14.6 using ruby-build 20191225) Inspect or clean up the working tree at /var/folders/r5/_282n9zn4lg2gb29mtz39_8r0000gn/T/ruby-build.20191227155826.29602.YeYTvQ Results logged to /var/folders/r5/_282n9zn4lg2gb29mtz39_8r0000gn/T/ruby-build.20191227155826.29602.log Last 10 log lines: _s_server_main in s_server.o "_verify_stateless_cookie_callback", referenced from: _s_server_main in s_server.o "_wait_for_async", referenced from: _s_client_main in s_client.o _sv_body in s_server.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[1]: *** [apps/openssl] Error 1 make: *** [all] Error 2 $ $ tail -n 100 /var/folders/r5/_282n9zn4lg2gb29mtz39_8r0000gn/T/ruby-build.20191227155826.29602.log "_save_serial", referenced from: _ca_main in ca.o _x509_main in x509.o "_set_cert_ex", referenced from: _ca_main in ca.o _req_main in req.o _x509_main in x509.o "_set_cert_key_stuff", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_set_cert_stuff", referenced from: _s_time_main in s_time.o "_set_cert_times", referenced from: _do_body in ca.o _req_main in req.o _x509_main in x509.o "_set_ext_copy", referenced from: _ca_main in ca.o "_set_keylog_file", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_set_nameopt", referenced from: _ca_main in ca.o _crl_main in crl.o _req_main in req.o _s_client_main in s_client.o _s_server_main in s_server.o _s_time_main in s_time.o _verify_main in verify.o ... "_setup_engine", referenced from: _ca_main in ca.o _cms_main in cms.o _dgst_main in dgst.o _dhparam_main in dhparam.o _dsa_main in dsa.o _dsaparam_main in dsaparam.o _ec_main in ec.o ... "_setup_ui_method", referenced from: _main in openssl.o "_setup_verify", referenced from: _cms_main in cms.o _crl_main in crl.o _ocsp_main in ocsp.o _pkcs12_main in pkcs12.o _smime_main in smime.o _verify_main in verify.o "_ssl_ctx_add_crls", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_ssl_ctx_security_debug", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_ssl_ctx_set_excert", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_ssl_excert_free", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_ssl_load_stores", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_ssl_print_groups", referenced from: _www_body in s_server.o _print_connection_info in s_server.o "_ssl_print_point_formats", referenced from: _print_connection_info in s_server.o "_ssl_print_sigalgs", referenced from: _print_stuff in s_client.o _www_body in s_server.o _print_connection_info in s_server.o "_ssl_print_tmp_key", referenced from: _print_stuff in s_client.o "_store_setup_crl_download", referenced from: _verify_main in verify.o "_tlsext_cb", referenced from: _s_client_main in s_client.o _rev_body in s_server.o _www_body in s_server.o _sv_body in s_server.o "_verify_args", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o _s_time_main in s_time.o _doConnection in s_time.o "_verify_callback", referenced from: _s_client_main in s_client.o _s_server_main in s_server.o "_verify_cookie_callback", referenced from: _s_server_main in s_server.o "_verify_stateless_cookie_callback", referenced from: _s_server_main in s_server.o "_wait_for_async", referenced from: _s_client_main in s_client.o _sv_body in s_server.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[1]: *** [apps/openssl] Error 1 make: *** [all] Error 2 $ $ brew uninstall binutils Uninstalling /usr/local/Cellar/binutils/2.32... (134 files, 167.5MB) $ $ rbenv install 2.7.0 Downloading openssl-1.1.1d.tar.gz... -> https://dqw8nmjcqpjn7.cloudfront.net/1e3a91bc1f9dfce01af26026f856e064eab4c8ee0a8f457b5ae30b40b8b711f2 Installing openssl-1.1.1d... Installed openssl-1.1.1d to /Users/st1t/.rbenv/versions/2.7.0 Downloading ruby-2.7.0.tar.bz2... -> https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.0.tar.bz2 Installing ruby-2.7.0... ruby-build: using readline from homebrew Installed ruby-2.7.0 to /Users/st1t/.rbenv/versions/2.7.0 $