diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index fb998dee5ae..0e3ae7f7222 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -245,8 +245,6 @@
       <not-null/>
     </arg>
   </function>
-  <!-- int timercmp(struct timeval *a, struct timeval *b, CMP)-->
-  <define name="timercmp(a,b,CMP)" value="(((a)-&gt;tv_sec == (b)-&gt;tv_sec) ? ((a)-&gt;tv_usec CMP (b)-&gt;tv_usec) : ((a)-&gt;tv_sec CMP (b)-&gt;tv_sec))"/>
   <!-- int __builtin_types_compatible_p (type1, type2) -->
   <function name="__builtin_types_compatible_p">
     <noreturn>false</noreturn>
diff --git a/test/testlibrary.cpp b/test/testlibrary.cpp
index fc5b2f1fda0..1bdc06f5182 100644
--- a/test/testlibrary.cpp
+++ b/test/testlibrary.cpp
@@ -70,6 +70,7 @@ class TestLibrary : public TestFixture {
         TEST_CASE(container);
         TEST_CASE(version);
         TEST_CASE(loadLibErrors);
+        TEST_CASE(loadLibCombinations);
     }
 
     static bool loadxmldata(Library &lib, const char xmldata[], std::size_t len)
@@ -1065,6 +1066,13 @@ class TestLibrary : public TestFixture {
         // comma followed by dot
         LOADLIB_ERROR_INVALID_RANGE("-10:0,.5:");
     }
+
+    void loadLibCombinations() const {
+        {
+            const Settings s = settingsBuilder().library("std.cfg").library("gnu.cfg").library("bsd.cfg").build();
+            ASSERT_EQUALS(s.library.defines.empty(), false);
+        }
+    }
 };
 
 REGISTER_TEST(TestLibrary)