At DEINSTALL time after un-registering info files from the Info

directory file remove it if it is empty i.e. if it contains only one
menu/entry line i.e. only one line starting with '*'.

This allow INFO_DIR to be set to a package specific directory while
not registering in the PLIST the Info directory file (${INFOR_DIR}/dir).

Registering such an Info directory file in the PLIST is not really
possible as a md5 signature of it holding the registered info entries
would be stored in PKG_DBDIR. At deinstall time this signature would not be
matched because the DEINSTALL script would have modified it by
un-registering the info files from it. Hence the package removal would
be reported as incomplete...

You are probably right if this looks like a hack to you...

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