First, Ubuntu and Debian dropped libmozjs185 as a supported package.
Then, RedHat/Fedora/CentOS broke our shipped, working package by redefining a header in a patch release incompatibly, forcing a rebuild.
So, we're just building and shipping our own couch-libmozjs185 / couch-js packages now.
While we‘re at it, we’re going to make sure both platforms have both sets of patches, so behaviour is consistent across Linux distributions. We're also going to be sure that we use the configure options that we know work (specifically, we add --disable-methodjit as we have found this increases runtime stability.)
The hope is that all of this goes away and is replaced by ChakraCore.