Hello,

There is no substitute for /gnu/store/9b5y8vr3q67cx7gm41k5snkk9g4gmvdn-libdrm-2.4.98 on
<https://ci.guix.gnu.org>.

Unfortunately I don't know what the problem is.  There is no build log:
<https://ci.guix.gnu.org/log/9b5y8vr3q67cx7gm41k5snkk9g4gmvdn-libdrm-2.4.98>.

Does Cuirass provide more information about the failed derivation
somewhere?