diff -Naur ucspi-unix-0.36.orig/env.c ucspi-unix-0.36/env.c
--- ucspi-unix-0.36.orig/env.c	2002-06-10 23:12:06.000000000 +0200
+++ ucspi-unix-0.36/env.c	2008-11-06 16:31:09.000000000 +0100
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <sysdeps.h>
+#include <sys/socket.h>
 
 extern const char* utoa(unsigned long);