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diff -up libdap-3.18.1/unit-tests/D4FilterClauseTest.cc.getopt libdap-3.18.1/unit-tests/D4FilterClauseTest.cc
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--- libdap-3.18.1/unit-tests/D4FilterClauseTest.cc.getopt	2016-05-05 17:43:15.000000000 -0600
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+++ libdap-3.18.1/unit-tests/D4FilterClauseTest.cc	2016-08-12 14:00:24.398185600 -0600
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@@ -566,7 +566,7 @@ int main(int argc, char*argv[]) {
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     runner.addTest(CppUnit::TestFactoryRegistry::getRegistry().makeTest());
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     GetOpt getopt(argc, argv, "d");
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-    char option_char;
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+    int option_char;
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     while ((option_char = getopt()) != EOF)
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         switch (option_char) {