Ticket 46 - undefined reference to abstraction increment.
    
    Bug Description:  During the build of liblfds it would result in nunc-stans
    that did not have the exported function abstraction_increment.
    
    Fix Description:  This was due to an incorrect ifdef statement, where it
    specified gcc version >= 4 and minor >= 1. Of course, gcc 6.0 will satisfy
    the first condition, but not the second.
    
    https://fedorahosted.org/nunc-stans/ticket/46
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)