MESSAGE is for information that is so important to someone who
installs a package that bad things might happen if that information is
not known. This file contains a statement about the kinds of header
files that are installed. This is both unimportant, in that nothing
happens unless you try to build with the header file, and redundant
with the upstream documentation of how to use the library.
Additionally, the vast majority of people installing this package do
so as a dependency of some other package, not because they are trying
to write code that uses the library -- and if so they need to read the
upstream documentation anyway.
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