https://bugs.gentoo.org/914565
--- a/gcc/gcc/system.h
+++ b/gcc/gcc/system.h
@@ -201,6 +201,9 @@ extern int fprintf_unlocked (FILE *, con
 #ifdef INCLUDE_STRING
 # include <string>
 #endif
+#ifdef INCLUDE_VECTOR
+# include <vector>
+#endif
 #endif
 
 /* There are an extraordinary number of issues with <ctype.h>.
@@ -229,9 +232,6 @@ extern int errno;
 #ifdef INCLUDE_SET
 # include <set>
 #endif
-#ifdef INCLUDE_VECTOR
-# include <vector>
-#endif
 #ifdef INCLUDE_ARRAY
 # include <array>
 #endif
--- a/gcc/libcc1/libcc1plugin.cc
+++ b/gcc/libcc1/libcc1plugin.cc
@@ -19,6 +19,8 @@
 
 #include <cc1plugin-config.h>
 
+#include <vector>
+
 #undef PACKAGE_NAME
 #undef PACKAGE_STRING
 #undef PACKAGE_TARNAME
@@ -69,8 +71,6 @@
 #include "gcc-c-interface.h"
 #include "context.hh"
 
-#include <vector>
-
 using namespace cc1_plugin;
 
 
--- a/gcc/libcc1/libcp1plugin.cc
+++ b/gcc/libcc1/libcp1plugin.cc
@@ -20,6 +20,8 @@
 
 #include <cc1plugin-config.h>
 
+#include <vector>
+
 #undef PACKAGE_NAME
 #undef PACKAGE_STRING
 #undef PACKAGE_TARNAME
@@ -71,8 +73,6 @@
 #include "rpc.hh"
 #include "context.hh"
 
-#include <vector>
-
 using namespace cc1_plugin;