diff --git a/libc/integral/c.inc b/libc/integral/c.inc
index 0f29ff5f0..1f7e273c6 100644
--- a/libc/integral/c.inc
+++ b/libc/integral/c.inc
@@ -524,6 +524,9 @@ typedef struct {
 #pragma GCC diagnostic ignored "-Wuser-defined-literals" /* reserved for me */
 #endif
 
+#pragma GCC diagnostic warning "-Wimplicit-function-declaration"
+#pragma GCC diagnostic warning "-Wincompatible-pointer-types"
+#pragma GCC diagnostic warning "-Wint-conversion"
 #pragma GCC diagnostic ignored "-Wformat-extra-args"     /* todo: patch gcc */
 #pragma GCC diagnostic ignored "-Wunused-function"       /* contradicts dce */
 #pragma GCC diagnostic ignored "-Wunused-const-variable" /* sooo ridiculous */