mysql - R, Install "RMySQL" On MAC - curl: (23) Failed writing body -

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i'm attempting install rmysql package in r using mac running os x el capitan receive errors haven't seen before. see below:

enter image description here

mysql , curl installed. i've tried few things such uninstalling , re-installing mysql , running installing package manually via terminal. advice or assistance helpful.

do have proxy setting on machine? seems internet connection problem. if have proxy, can set in r :

>sys.setenv(http_proxy="url") >sys.setenv(https_proxy="url")

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