make error on macOS

[tangleiao]

[ 34%] Linking CXX executable qconf_agent Undefined symbols for architecture x86_64: "_libssh2_agent_connect", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_disconnect", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_free", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_get_identity", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_init", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_list_identities", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_agent_userauth", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_free", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_read_ex", referenced from: _scp_recv in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_send_eof", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_wait_closed", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_wait_eof", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_channel_write_ex", referenced from: _scp_send in libcurl.a(libcurl_la-ssh.o) "_libssh2_hostkey_hash", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_add", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_check", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_free", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_init", referenced from: _ssh_connect in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_readfile", referenced from: _ssh_connect in libcurl.a(libcurl_la-ssh.o) "_libssh2_knownhost_writefile", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_scp_recv", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_scp_send64", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_block_directions", referenced from: _ssh_multi_statemach in libcurl.a(libcurl_la-ssh.o) _scp_recv in libcurl.a(libcurl_la-ssh.o) _scp_send in libcurl.a(libcurl_la-ssh.o) _sftp_recv in libcurl.a(libcurl_la-ssh.o) _sftp_send in libcurl.a(libcurl_la-ssh.o) _ssh_block_statemach in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_disconnect_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_free", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_hostkey", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_init_ex", referenced from: _ssh_connect in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_last_errno", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_last_error", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_set_blocking", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_session_startup", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_close_handle", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_init", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_last_error", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_mkdir_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_open_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_read", referenced from: _sftp_recv in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_readdir_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_rename_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_rmdir_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_seek64", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_shutdown", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_stat_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_symlink_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_unlink_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_sftp_write", referenced from: _sftp_send in libcurl.a(libcurl_la-ssh.o) "_libssh2_userauth_authenticated", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_userauth_keyboard_interactive_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_userauth_list", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_userauth_password_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.o) "_libssh2_userauth_publickey_fromfile_ex", referenced from: _ssh_statemach_act in libcurl.a(libcurl_la-ssh.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[2]: *** [agent/qconf_agent] Error 1 make[1]: *** [agent/CMakeFiles/qconf_agent.dir/all] Error 2 make: *** [all] Error 2