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(libtool.info)When tests fail

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When tests fail
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   Each of the above tests are designed to produce no output when they
are run via `make check'.  The exit status of each program tells the
`Makefile' whether or not the test succeeded.

   If a test fails, it means that there is either a programming error in
libtool, or in the test program itself.

   To investigate a particular test, you may run it directly, as you
would a normal program.  When the test is invoked in this way, it
produces output which may be useful in determining what the problem is.

   Another way to have the test programs produce output is to set the
VERBOSE environment variable to `yes' before running them.  For
example, `env VERBOSE=yes make check' runs all the tests, and has each
of them display debugging information.