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+title: libtap
+parent: FAQ
+---
+
+# How do I prove the C routines work?
+
+We use [libtap][libtap] to test C routines that are in `lib/utils_*.c`.  The
+tests are in `lib/tests/test_*.c`.
+
+The latest libtap version is currently 1.01.  However, there is a bug with the
+thread implementation.  To workaround, run:
+
+    CPPFLAGS="-UHAVE_LIBPTHREAD" ./configure
+    make
+    make check
+    make install
+
+Now when you run the Nagios Plugins `./configure` script, it should find the
+libtap library and compile the tests and run them when you run `make` `test`.
+
+*Update:* These days, the Nagios Plugins tarball includes a copy of libtap
+which is used if you run `./configure` `--enable-libtap`.
+
+[libtap]: http://jc.ngo.org.uk/trac-bin/trac.cgi/wiki/LibTap "libtap"
+
+<!--% # vim:set filetype=markdown textwidth=78 joinspaces: # %-->