How to tell global to ignore specific extensions?

From --help I know about langmap, but global seems to ignore it. I'm using
the default but global still tries to search pdf and xls files because I get
messages like these:

Warning: 'share/scripts/optmon/dependency cache/UnnamedPackage.dependency'
ignored, because it includes blank.

.dependency isn't in the default langmap at all. Bug or do I misunderstand
how this works? I only want .c/.C/.cpp/.h/.H/.hpp files tagged.

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