diff --git a/Makefile b/Makefile
index 917a113..268b66f 100644
--- a/Makefile
+++ b/Makefile
@@ -9,10 +9,18 @@ NIXIE ?= nixie
 COV_MIN ?= 0 # Minimum line coverage percentage for coverage targets
 
 define CHECK_CARGO_LLVM_COV
-	@command -v cargo-llvm-cov >/dev/null || { \
-	echo "error: cargo-llvm-cov not found. Install with: cargo install cargo-llvm-cov"; \
-	exit 127; \
-	}
+        @command -v cargo-llvm-cov >/dev/null || { \
+        echo "error: cargo-llvm-cov not found. Install with: cargo install cargo-llvm-cov" >&2; \
+        exit 127; \
+        }
+        @command -v rustup >/dev/null || { \
+        echo "error: rustup not found. Install from: https://rustup.rs" >&2; \
+        exit 127; \
+        }
+        @rustup component list --installed | grep -q '^llvm-tools-preview' || { \
+        echo "error: rustup component llvm-tools-preview not found. Install with: rustup component add llvm-tools-preview" >&2; \
+        exit 127; \
+        }
 endef
 
 build: target/debug/$(APP) ## Build debug binary