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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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