text: #include <features.h> // needed because it is assumed to already be there when
                        // errno.h is partially included
  
  #define __need_Emath
  #include <errno.h>
  
  #include <errno.h>
  
  int main()
  {
      // verify that a symbol from 'errno.h' is actually available.
      int i = errno;
      (void)i;
  
      return 0;
  }
  
  // ----------------------------------------------------------------------------
  // Copyright 2018 Bloomberg Finance L.P.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  // ----------------------------- END-OF-FILE ----------------------------------
  