https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77470
--- Comment #1 from coypu <coypu at sdf dot org> --- Created attachment 39560 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39560&action=edit Correct includes for libssp This gets me a bit further, but I still have trouble using it. For netbsd we have in stdio.h: #if _FORTIFY_SOURCE > 0 #include <ssp/stdio.h> #endif for non-netbsd, you can likely achieve the same failure by attempting to compile this code: #define _FORTIFY_SOURCE #include <stdio.h> #include <ssp/stdio.h> void main() { printf("Hello!"); }