c_core.c:601:1: warning: "__USE_GNU" redefined
In file included from /usr/include/errno.h:29,
                 from c_core.h:66,
                 from c_core.c:10:
/usr/include/features.h:303:1: warning: this is the location of the previous definition
c_core.c:1535: warning: conflicting types for built-in function 'free'
c_core.c:1593: warning: conflicting types for built-in function 'realloc'
acws-0203 258% ltr