(Also looks like I suck at reading libxml2 source code. xmlSaveSetIndentString has been deprecated for five months, not two years.)
xmlSaveSetIndentString is not deprecated, did you mean something else?
The recommended replacement is configuring the save context, using a function that doesn't exist until 2.14
But that won't work for the `xmlNodeDumpOutput` case, should we report that usecase to them?