--- libxtract-git-5d301b0eb.old/src/vector.c
+++ libxtract-git-5d301b0eb/src/vector.c
@@ -28,8 +28,9 @@
 #include <stdlib.h>
 #include <assert.h>
 
-#include "fft.h"
+#define INSTANTIATE_MATE 1
 
+#include "fft.h"
 #include "xtract/libxtract.h"
 #include "xtract_macros_private.h"
 #include "xtract_globals_private.h"
--- libxtract-git-5d301b0eb.old/src/xtract_globals_private.h
+++ libxtract-git-5d301b0eb/src/xtract_globals_private.h
@@ -32,7 +32,11 @@
 #ifdef __cplusplus
 #define GLOBAL extern "C"
 #else
+#ifdef INSTANTIATE_MATE
 #define GLOBAL
+#else
+#define GLOBAL extern
+#endif
 #endif
 
 #ifdef USE_OOURA