--- a/src/libetm-0.5.0/tcp_socket.c       2020-01-09 10:49:20.000000000 +0100
+++ b/src/libetm-0.5.0/tcp_socket.c.new   2020-06-04 08:57:53.532982208 +0200
@@ -24,6 +24,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/select.h>
 #ifndef WIN32_V
 #  include <sys/socket.h>
 #  include <netdb.h>