--- a/builders/hardsid-builder/hardsid-emu-unix.cpp	2015-05-10 12:47:53.000000000 -0000
+++ a/builders/hardsid-builder/hardsid-emu-unix.cpp	2021-01-06 12:25:57.477866817 -0000
@@ -26,6 +26,7 @@ 
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
 #include <cstdio>
 #include <sstream>
 #include <string>