diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index c8019b18a275492ce6f5d8b896a58e1f1d4ad383..3993994b19ba3db40329b1d8ec4f962eb1724d4a 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -57,7 +57,7 @@ declare -A target=(["linux/amd64"]="x86_64_v2" ["linux/arm64"]="aarch64")
 target=${target[${TARGETPLATFORM}]}
 spack config --scope site add "packages:all:require:[target=${target}]"
 spack config --scope site add "packages:all:target:[${target}]"
-spack external find --scope site llvm
+spack external find --not-buildable --scope site llvm
 spack config blame packages
 spack config --scope user add "config:suppress_gpg_warnings:true"
 spack config --scope user add "config:build_jobs:${jobs}"