undefined external reference

from Jargon File (4.4.4, 14 Aug 2003)

undefined external reference
 excl.

   [Unix] A message from Unix's linker. Used in speech to flag loose ends
   or dangling references in an argument or discussion.

from The Free On-line Dictionary of Computing (8 July 2008)

undefined external reference

   [Unix] A message from {Unix}'s linker, {ld}.  Used in speech
   to flag loose ends or dangling references in an argument or
   discussion.

   [{Jargon File}]

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