Install the toolchain and pre-requisites, if necessary:
# yum install make automake gcc gcc-c++ kernel-devel
# yum install alsa-lib-devel autoconf automake avahi-devel libconfig-devel libdaemon-devel openssl-devel popt-devel soxr-devel
Download the tarball from the "releases" tab on github or use wget and then use rpmbuild. This example is for version 2.6:
$ wget -O shairport-sync-2.6.tar.gz https://github.com/mikebrady/shairport-sync/archive/2.6.tar.gz
$ rpmbuild -ta shairport-sync-2.6.tar.gz
The -ta means "build all from this tarball".
The RPM will be built in a directory and will have a pathname like, for example, ~/rpmbuild/RPMS/i686/shairport-sync-2.6-1.fc22.i686.rpm You should then install it with (for this example):
# rpm -i ~/rpmbuild/RPMS/i686/shairport-sync-2.6-1.fc22.i686.rpm
You may have to manually create the directory /var/shairport-sync for the installation to succeed. Having edited the configuration file /etc/shairport-sync.conf as appropriate (see ("Configuring Shairport Sync")[https://github.com/mikebrady/shairport-sync/blob/master/README.md#configuring-shairport-sync]), enable and start the service with:
# systemctl enable shairport-sync.service
# systemctl start shairport-sync.service