Starting with version 2.2.0, we include two spec files for newer 2.6 based RPM distros.
packaging/suse/openswan.spec packaging/redhat/openswan.26spec
You can use those to easily build some RPMs - eg:
tar -xzvf openswan-2.2.0.tar.gz edit openswan-2.2.0/packaging/redhat/openswan.26spec # make your changes, and probably change the version numbers at the top rpmbuild -ba openswan-2.2.0/packaging/redhat/openswan.26spec
If you create a .spec for another distribution, please let us know so we can include it in the distribution.
You may want to copy the source openswan-2.2.0.tar.gz to /usr/src/redhat/SOURCES/ in order to avoid a second download of the source by the command rpmbuild.
