diff --git a/artiq/test/lit/lit.cfg b/artiq/test/lit/lit.cfg
index 10497bdd0..693383297 100644
--- a/artiq/test/lit/lit.cfg
+++ b/artiq/test/lit/lit.cfg
@@ -2,7 +2,6 @@
 
 import os
 import sys
-import subprocess
 import lit.util
 import lit.formats
 
@@ -27,16 +26,7 @@ not_ = "{} {}".format(sys.executable, os.path.join(root, "lit", "not.py"))
 config.substitutions.append( ("%not", not_) )
 
 if os.name == "posix":
-    support_lib = os.getenv("LIBARTIQ_SUPPORT")
-    if not support_lib:
-        support_build = os.path.join(root, "libartiq_support")
-        if subprocess.call(["rustc", os.path.join(support_build, "lib.rs"),
-                                     "--out-dir", support_build,
-                                     "-Cpanic=unwind", "-g"]) != 0:
-            lit_config.fatal("Unable to build JIT support library")
-
-        support_lib = os.path.join(support_build, "libartiq_support.so")
-    config.environment["LIBARTIQ_SUPPORT"] = support_lib
+    config.environment["LIBARTIQ_SUPPORT"] = os.getenv("LIBARTIQ_SUPPORT")
     config.environment["RUST_BACKTRACE"] = "1"
 
     config.available_features.add("exceptions")