I think this was due to those binaries being in a location that wasn't in $PATH, please try again with 1.5~git20190812-107d469-1~exp2 in experimental, which should fix this issue.
I think this was due to those binaries being in a location that wasn't in $PATH, please try again with 1.5~git20190812-107d469-1~exp2 in experimental, which should fix this issue.