diff --git a/src/SPC/toolchain/ToolchainManager.php b/src/SPC/toolchain/ToolchainManager.php
index 3264b14f..f3fbdf28 100644
--- a/src/SPC/toolchain/ToolchainManager.php
+++ b/src/SPC/toolchain/ToolchainManager.php
@@ -26,8 +26,7 @@ class ToolchainManager
         }
         $libc = getenv('SPC_LIBC');
         if ($libc && !getenv('SPC_TARGET')) {
-            // TODO: @crazywhalecc this breaks tests
-            // logger()->warning('SPC_LIBC is deprecated, please use SPC_TARGET instead.');
+            trigger_error('Setting SPC_LIBC is deprecated, please use SPC_TARGET instead.', E_USER_DEPRECATED);
             return match ($libc) {
                 'musl' => SystemUtil::isMuslDist() ? GccNativeToolchain::class : MuslToolchain::class,
                 'glibc' => !SystemUtil::isMuslDist() ? GccNativeToolchain::class : throw new WrongUsageException('SPC_LIBC must be musl for musl dist.'),