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This is recommended practice as per
https://www.gnu.org/software/automake/manual/html_node/Local-Macros.html.
It fixes the problem that arose when one of the maintainers could not build LibVNCServer
after https://github.com/LibVNC/libvncserver/pull/38 was merged.
Symptoms included
checking whether make sets $(MAKE)... yes
./configure: line 2481: syntax error near unexpected token `rfb/rfbconfig.h'
./configure: line 2481: `AX_PREFIX_CONFIG_H(rfb/rfbconfig.h)'
until autoconf-archive was installed (which was a previously unmentioned
requirement for Pull Request #38) – this is not always an option, in particular
when the project needs to be built using a system-wide autoconf installation
that cannot be modified easily by the developer.
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