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Formerly make.texinfo.~85~
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@ -3115,6 +3115,9 @@ line, and if its name consists only of letters, numbers, and underscores.
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Some shells cannot cope with environment variable names consisting of
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characters other than letters, numbers, and underscores.
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The special variables @code{SHELL} and @code{MAKEFLAGS} are always exported.
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@code{MAKEFILES} is exported if you set it to anything.
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Variables are @emph{not} normally passed down if they were created by
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default by @code{make} (@pxref{Implicit Variables, ,Variables Used by
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Implicit Rules}). The sub-@code{make} will define these for
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