Symbol not found: _libiconv failed on load redisgears.so #4

1215:M 22 Aug 2020 09:16:55.617 # Server initialized
1215:M 22 Aug 2020 09:16:55.618 * Loading RDB produced by version 6.0.6
1215:M 22 Aug 2020 09:16:55.618 * RDB age 33562 seconds
1215:M 22 Aug 2020 09:16:55.618 * RDB memory usage when created 0.96 Mb
1215:M 22 Aug 2020 09:16:55.618 * DB loaded from disk: 0.001 seconds
1215:M 22 Aug 2020 09:16:55.618 * Ready to accept connections
1215:M 22 Aug 2020 09:16:59.109 # Module /Users/yuanke/redisLab-ghSrc/MultiModelExample/redisgears.so failed to load: dlopen(/Users/yuanke/redisLab-ghSrc/MultiModelExample/redisgears.so, 6): Symbol not found: _libiconv
Referenced from: /Users/yuanke/redisLab-ghSrc/MultiModelExample/redisgears.so
Expected in: flat namespace
in /Users/yuanke/redisLab-ghSrc/MultiModelExample/redisgears.so
^C1215:signal-handler (1598059048) Received SIGINT scheduling shutdown...
1215:M 22 Aug 2020 09:17:28.991 # User requested shutdown...
1215:M 22 Aug 2020 09:17:28.991 * Saving the final RDB snapshot before exiting.
1215:M 22 Aug 2020 09:17:28.993 * DB saved on disk
1215:M 22 Aug 2020 09:17:28.993 # Redis is now ready to exit, bye bye...