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This is a new feature from the GNU Make TODO list that I've take a shot at because it will come in handy to deal with the $(commands ) mess/load.

The feature works like this, .MUST_MAKE is a target variable which will be looked for when a file is being considered for make but none of the prereqs requires it to be made. It is expanded in a limited file context, that means that $+, $^{, $? and $| are not readily available and weird stuff may yet happen because of VPATH. If .MUST_MAKE expands to a non-zero string after stripping, it will force the file to be made. Otherwise the file won't be made on its account at least.}

Simple multiple condition statement borrowed from REXX (yet again). Test whenN-cond and expand the whenN-body of the first which holds true. If all are false, the empty string is returned. Special condition strings for the sake of tradition: default, default:, otherwise}}}, and otherwise.

$(root name...) will extract the root specifier from the given names. Useful for checking whether a file name is an absolute path or not on Windows and OS/2.