build missing Debian package dependency from source?

I'm currently trying to install PCP on Debian with sparc64. Unfortunately it requires the package libreadline6 (>= 6.0) which doesn't have an apt package for sparc64. libreadline7 does and is installed. My solution was building gnu readline v6.3 from source (which worked), however I'm unsure how to proceed from here. Installing PCP via apt again lists the missing libreadline6 dependency. Is there another solution to this, other than building PCP completely from source as well?