Fedora 29

curl --output masterspline-archive-keyring.rpm \
    https://packages.masterspline.eu/fedora/29/x86_64/packages/masterspline-archive-keyring-2-1.fc29.noarch.rpm
sudo rpm -i masterspline-archive-keyring.rpm
sudo dnf install -y build2-toolchain

CentOS 7/RedHat 7

curl --output masterspline-archive-keyring.rpm \
    https://packages.masterspline.eu/centos/7/x86_64/packages/masterspline-archive-keyring-2-1.el7.noarch.rpm
sudo rpm -i masterspline-archive-keyring.rpm
sudo yum install -y build2-toolchain

CentOS 6/RedHat 6

curl --output masterspline-archive-keyring.rpm \
    https://packages.masterspline.eu/centos/6/x86_64/packages/masterspline-archive-keyring-2-1.el6.noarch.rpm
sudo rpm -i masterspline-archive-keyring.rpm
sudo yum install -y build2-toolchain