sudo yum install fedora-packager -y
wget https://kojipkgs.fedoraproject.org//packages/glibc/2.20.90/19.fc22/src/glibc-2.20.90-19.fc22.src.rpm
sudo yum-builddep glibc-2.20.90-19.fc22.src.rpm -y
rpmdev-setuptree
rpm -ivh glibc-2.20.90-19.fc22.src.rpm
rpmbuild -ba rpmbuild/SPECS/glibc.spec