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* Allows us to check for the Gob2 version at ./configure time
* this file ships with Gob2 installations, so in most cases
it could be found without shipping it with SciTECO.
* Autoconf is built such that source distributions will contain
all additional external macros compiled in aclocal.m4.
* However if somebody builds from Git, he/she would still
expect the ./configure checks to produce meaningful results
even if not all dependencies are installed properly.
It therefore seems to be good practice to include all
external M4 macros (gob2.m4) as a fallback with the source tree.
* /usr/share/aclocal contains many more useful m4 macros.
However since we can depend on pkg-config e.g. for finding
Gtk+ and Glib, I won't use those macros as else I would
have to bundle them to achieve the same kind of ./configure
robustness.
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