some thing wrong with openresty-1.13.6.2

[CaesarC]

objs/addon/nginx-ipip-module/ngx_http_ipip_module.o:(.data+0x4c0): multiple definition of `ngx_http_ipip_module'
objs/addon/nginx-ipip-module/ngx_http_ipip_module.o:(.data+0x4c0): first defined here
objs/addon/nginx-ipip-module/ngx_http_ipip_module.o: In function `strtok_r_2':
/var/softs/nginx-ipip-module/ngx_http_ipip_module.c:55: multiple definition of `strtok_r_2'
objs/addon/nginx-ipip-module/ngx_http_ipip_module.o:/var/softs/nginx-ipip-module/ngx_http_ipip_module.c:55: first defined here
collect2: error: ld returned 1 exit status
gmake[2]: *** [objs/nginx] Error 1
gmake[2]: Leaving directory `/var/softs/openresty-1.13.6.2/build/nginx-1.13.6'
gmake[1]: *** [build] Error 2
gmake[1]: Leaving directory `/var/softs/openresty-1.13.6.2/build/nginx-1.13.6'
gmake: *** [all] Error 2