The code generator for enums emits one extra newline before the name in _gen/telepathy-enums-gtk-doc.h, and this is not accepted by newer gobject-introspection. Removing the newline on line 104 of tools/c-constants-gen.py fixes it.
Already fixed in 0.18 and master branches, will be released in 0.18.1 and 0.19.0 respectively. *** This bug has been marked as a duplicate of bug 48363 ***
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