--- lib/chardetect/src/entry/impl.cpp.orig
+++ lib/chardetect/src/entry/impl.cpp
@@ -42,7 +42,9 @@
 #include "nscore.h"
 #include "nsUniversalDetector.h"
 #include <string.h>
+#pragma GCC visibility push(default)
 #include <stdlib.h>
+#pragma GCC visibility pop
 
 #ifdef _WIN32
 #   include <windows.h>
--- lib/chardetect/src/prmem.h.orig
+++ lib/chardetect/src/prmem.h
@@ -37,7 +37,9 @@
 #ifndef nsDummyPrmem_h__
 #define nsDummyPrmem_h__
 
+#pragma GCC visibility push(default)
 #include <stdlib.h>
+#pragma GCC visibility pop
 
 inline void* PR_Malloc(size_t len)
 {