ruby/internal/config.h needs to be included first

to define USE_MJIT.

mjit.c

@@ -11,9 +11,10 @@
 
 // To share variables privately, include mjit_worker.c instead of linking.
 
+#include "ruby/internal/config.h" // defines USE_MJIT
+
 #if USE_MJIT
 
-#include "ruby/internal/config.h"
 #include "constant.h"
 #include "id_table.h"
 #include "internal.h"

mjit.h

@@ -8,7 +8,7 @@
 
 **********************************************************************/
 
-#include "ruby/internal/config.h"
+#include "ruby/internal/config.h" // defines USE_MJIT
 #include "ruby/internal/stdbool.h"
 #include "vm_core.h"
 

mjit_compile.c

@@ -10,7 +10,7 @@
 // call Ruby methods (C functions that may call rb_funcall) or trigger
 // GC (using ZALLOC, xmalloc, xfree, etc.) in this file.
 
-#include "ruby/internal/config.h"
+#include "ruby/internal/config.h" // defines USE_MJIT
 
 #if USE_MJIT