Perform the following on a build box as a non-root user.
sudo yum -y install rpmdevtools pcre-devel gcc make openssl-devel rpm-build
rpmdev-setuptree
rpmbuild -bb ~/rpmbuild/SPECS/haproxy.spec
Resulting RPM will be in /opt/rpm-haproxy/rpmbuild/RPMS/
1.7.4
Based on the Red Hat 6.4 RPM spec for haproxy 1.4 combined with work done by @nmilford @resmo and @kevholmes