diff -Nur sendd-0.2.orig/Makefile.config sendd-0.2/Makefile.config
--- sendd-0.2.orig/Makefile.config	2009-08-17 17:05:31.000000000 +0200
+++ sendd-0.2/Makefile.config	2013-03-11 15:36:09.000000000 +0100
@@ -17,6 +17,7 @@
 
 # Edit this if your gcc cannot be found at the usual address
 #CC=gcc-4.0
+LEX=flex
 
 # Where to install
 prefix=/usr