Add another missing include to the spectran source

source_modules/spectran_source/src/main.cpp

@@ -12,6 +12,10 @@
 #include <locale>
 #include <aaroniartsaapi.h>
 
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
 #define CONCAT(a, b) ((std::string(a) + b).c_str())
 
 SDRPP_MOD_INFO{