diff --git a/recipes/dev/clang21/recipe.toml b/recipes/dev/clang21/recipe.toml
index 5c271acd9..c872eae58 100644
--- a/recipes/dev/clang21/recipe.toml
+++ b/recipes/dev/clang21/recipe.toml
@@ -10,6 +10,8 @@ dev-dependencies = [
     "libstdcxx", # no idea
     "llvm21.dev",
     "llvm21.runtime",
+    "host:xz",
+    "host:libarchive",  # workaround for cmake error
 ]
 script = """
 DYNAMIC_INIT
diff --git a/recipes/dev/lld21/recipe.toml b/recipes/dev/lld21/recipe.toml
index 65f3b2895..d3f0c8924 100644
--- a/recipes/dev/lld21/recipe.toml
+++ b/recipes/dev/lld21/recipe.toml
@@ -10,6 +10,8 @@ dependencies = [
 dev-dependencies = [
     "llvm21.dev",
     "llvm21.runtime",
+    "host:xz",
+    "host:libarchive",  # workaround for cmake error
 ]
 script = """
 DYNAMIC_INIT
diff --git a/recipes/wip/web/servo/recipe.toml b/recipes/wip/web/servo/recipe.toml
index 71253490c..71615aa66 100644
--- a/recipes/wip/web/servo/recipe.toml
+++ b/recipes/wip/web/servo/recipe.toml
@@ -12,6 +12,10 @@ dependencies = [
     "mesa",
     "zlib",
 ]
+dev-dependencies = [
+    "llvm21.dev",
+    "host:libarchive",  # workaround for cmake error
+]
 script = """
 DYNAMIC_INIT