Output build commands to tun. Incidentally, also fixes build

diff --git a/build b/build
index 3409ad7..43320ab 100755
--- a/build
+++ b/build
@@ -12,7 +12,7 @@
 #define ECHO_REQUEST        1
 
 // uncomment to show the full gcc commands when compiling
-// #define ECHO_COMPILE
+#define ECHO_COMPILE
 
 string  CLASSES;
 string  g_lopt;