Compiler Error - Need help, please

abstract_jb.o:/root/asterisk-certified-11.6-cert13/include/asterisk/strings.h:941: first defined here
xmldoc.o: In function ast_rq_is_int': /root/asterisk-certified-11.6-cert13/include/asterisk/config.h:816: multiple definition ofast_rq_is_int’
abstract_jb.o:/root/asterisk-certified-11.6-cert13/include/asterisk/config.h:816: first defined here
collect2: error: ld returned 1 exit status
Makefile:246: recipe for target ‘asterisk’ failed
make[1]: *** [asterisk] Error 1
Makefile:384: recipe for target ‘main’ failed
make: *** [main] Error 2

What distribution? What version of GCC (gcc --version)? If you try to build 11 non-certified does it work?

gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1)

yes, I did. No success.

Sounds like something with the development environment on the system is screwed up, as 11 is most certainly building fine…