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 2.5 How derived variables are named
 ===================================
 
 Sometimes a Makefile variable name is derived from some text the user
 supplies.  For instance, program names are rewritten into Makefile macro
 names.  Automake canonicalizes this text, so that it does not have to
 follow Makefile macro naming rules.  All characters in the name except
 for letters, numbers, and the underscore are turned into underscores
 when making macro references.  For example, if your program is named
 `sniff-glue', the derived variable name would be `sniff_glue_SOURCES',
 not `sniff-glue_SOURCES'.
 

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