diff --git a/scripts/smoke-test.sh b/scripts/smoke-test.sh
index ce137bd..6907ed2 100755
--- a/scripts/smoke-test.sh
+++ b/scripts/smoke-test.sh
@@ -244,6 +244,23 @@ else
     warn "Neither 'timeout' nor 'gtimeout' found; running without timeout protection"
 fi
 
+# On Linux, add ingot lib directories to LD_LIBRARY_PATH so the test
+# binary can find libraries shipped with the toolchain (e.g., libstdc++.so
+# built by GCC). Without this, the binary may link against the container's
+# older libstdc++ and fail with GLIBCXX version errors.
+# NOTE: Not set on macOS — DYLD_LIBRARY_PATH conflicts with system
+# frameworks and causes crashes. macOS toolchains use @rpath instead.
+if [[ "$(uname -s)" == "Linux" ]]; then
+    INGOT_LIB="${INGOT_ROOT}/lib"
+    INGOT_LIB64="${INGOT_ROOT}/lib64"
+    SMOKE_LD_PATH=""
+    [[ -d "$INGOT_LIB" ]] && SMOKE_LD_PATH="${INGOT_LIB}"
+    [[ -d "$INGOT_LIB64" ]] && SMOKE_LD_PATH="${SMOKE_LD_PATH:+${SMOKE_LD_PATH}:}${INGOT_LIB64}"
+    if [[ -n "$SMOKE_LD_PATH" ]]; then
+        export LD_LIBRARY_PATH="${SMOKE_LD_PATH}${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
+    fi
+fi
+
 set +e
 if [[ -n "$TIMEOUT_CMD" ]]; then
     $TIMEOUT_CMD "$TIMEOUT" "${WORK_DIR}/hello" > "${WORK_DIR}/actual" 2>&1