I‘m trying to build a RHEL 6 rpm of nginx server. But, I get the following error:

+ /usr/lib/rpm/brp-strip-comment-note
Checking for unpackaged file(s): /usr/lib/rpm/check-files /root/rpmbuild/BUILDROOT/nginx-1.0.5-1.el6.x86_64
error: Installed (but unpackaged) file(s) found:
/usr/local/nginx/conf/fastcgi.conf
/usr/local/nginx/conf/fastcgi.conf.default
…
….
.
/usr/local/nginx/html/50x.html
/usr/local/nginx/html/index.html
/usr/local/nginx/sbin/nginx

RPM build errors:
Installed (but unpackaged) file(s) found:
/usr/local/nginx/conf/fastcgi.conf
/usr/local/nginx/conf/fastcgi.conf.default
…
..
.
/usr/local/nginx/html/50x.html
/usr/local/nginx/html/index.html
/usr/local/nginx/sbin/nginx

How do I fix this problem and build rpm file?