rpmbuild: error: Installed (but unpackaged) file(s) found Solution

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?

To fix this error you need to specify the list of files that will be installed. This is done usong "%files" section. The syntax is as follows:

 
%files
%defattr(-,root,root,-)
/path/to/dir/
/path/to/file/
 

The above files can be set as follows in your .spec file (add before %changelog):

 
%files
%defattr(-,root,root,-)
%config(noreplace) /usr/local/nginx/conf/*
/usr/local/nginx/html/
/usr/local/nginx/sbin/nginx
 

The %files section identifies what files and directories were added by the package. Save and close the file. Now, you can rebuild an rpm as follows:
$ rpmbuild --bb nginx.spec