Checking this further, compiling newer versions of curl with IDN support requires libidn2, where previously it required libidn. libidn2 isn't currently provided by CentOS, but it is provided by EPEL. This may require that we provide an ea-libidn2 package. With this internal case, I believe this has been brought to the attention of our EA developers, but it wouldn't be a bad idea to make an official feature request either. Whether we'll move forward to provide this package, I cannot say, but there are a few workarounds; either using punycode or PHP IDN string conversion functions.