--- src/Backends/REFPROP/REFPROPMixtureBackend.orig.cpp	2022-12-22 22:24:56.000000000 +0100
+++ src/Backends/REFPROP/REFPROPMixtureBackend.cpp	2022-12-22 22:25:18.000000000 +0100
@@ -21,7 +21,7 @@
 
 #define REFPROP_IMPLEMENTATION
 #define REFPROP_CSTYLE_REFERENCES
-#include "externals/REFPROP-headers/REFPROP_lib.h"
+#include <REFPROP-headers/REFPROP_lib.h>
 #undef REFPROP_IMPLEMENTATION
 #undef REFPROP_CSTYLE_REFERENCES
 
