diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index f17ec89b1a..91ec1cf47f 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -119,6 +119,7 @@ MAKE=`searchgnu make` || exit $?
 
 searchgnu m4 > /dev/null
 searchgnu bison > /dev/null
+searchgnu flex > /dev/null
 
 cleanup()
 {