2019-08-09 11:10:29,484 [INFO] {8075} koji.build.buildroot:505 Running mock as kojibuilder
INFO: mock.py version 1.4.14 starting (python version = 3.7.3)...
Start: init plugins
INFO: selinux enabled
Finish: init plugins
Start: run
Start: clean chroot
Finish: clean chroot
Start: chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 1.4.14
INFO: Mock Version: 1.4.14
Start: dnf install
ERROR: Command failed: 
 # /usr/bin/dnf --installroot /var/lib/mock/f31-build-81056-31543/root/ --setopt=install_weak_deps=0 groupinstall build --setopt=tsflags=nocontexts
Unable to detect release version (use '--releasever' to specify release version)
Last metadata expiration check: 0:11:14 ago on Fri 09 Aug 2019 11:14:09 AM EDT.
Error: 
 Problem: package rpm-build-4.15.0-0.beta.2.fc31.riscv64 requires /usr/bin/gdb-add-index, but none of the providers can be installed
  - conflicting requests
  - nothing provides libreadline.so.7()(64bit) needed by gdb-headless-8.3.50.20190610-16.0.riscv64.fc31.riscv64
  - nothing provides libreadline.so.7()(64bit) needed by gdb-minimal-8.3.50.20190610-16.0.riscv64.fc31.riscv64