diff --git a/.clang-format-ignore b/.clang-format-ignore
new file mode 100644
index 0000000000000000000000000000000000000000..7a11125a80df6dbbfdabad7551afba2957fce11f
--- /dev/null
+++ b/.clang-format-ignore
@@ -0,0 +1,4 @@
+build/*
+vendor/*
+target/*
+src/binfmt_rto/binfmt_rto.c
diff --git a/tests/test_app/test_app.c b/tests/test_app/test_app.c
index a1959d735aed0b9a4f51029394e50b09b15ee094..19cb55613543108e2c73a11ecbfa3a19b2e81679 100644
--- a/tests/test_app/test_app.c
+++ b/tests/test_app/test_app.c
@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: MulanPSL-2.0 */
 #define _GNU_SOURCE
+#define __USE_GNU 1
+#include <dlfcn.h>
 #include <features.h>
 #include <pthread.h>
 #include <stdio.h>
@@ -7,7 +9,6 @@
 #include <string.h>
 #include <sys/time.h>
 #include <unistd.h>
-#include <dlfcn.h>
 
 extern int lib1_add(int a, int b);
 extern int lib2_add(int a, int b);