/usr/include/libinftext-0.6/ is in libinfinity-0.6-dev 0.6.7-1build1.
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/usr/include/libinftext-0.6/libinftext/
/usr/include/libinftext-0.6/libinftext/inf-text-buffer.h
/usr/include/libinftext-0.6/libinftext/inf-text-chunk.h
/usr/include/libinftext-0.6/libinftext/inf-text-default-buffer.h
/usr/include/libinftext-0.6/libinftext/inf-text-default-delete-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-default-insert-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-delete-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-filesystem-format.h
/usr/include/libinftext-0.6/libinftext/inf-text-fixline-buffer.h
/usr/include/libinftext-0.6/libinftext/inf-text-insert-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-move-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-operations.h
/usr/include/libinftext-0.6/libinftext/inf-text-remote-delete-operation.h
/usr/include/libinftext-0.6/libinftext/inf-text-session.h
/usr/include/libinftext-0.6/libinftext/inf-text-undo-grouping.h
/usr/include/libinftext-0.6/libinftext/inf-text-user.h