Bug: https://bugs.gentoo.org/221361
Reverts upstream commit eec7cdf0

--- a/configure.ac
+++ b/configure.ac
@@ -32,11 +32,6 @@ AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_LN_S
-AC_PROG_LEX([noyywrap])
-if test $LEX = ":"
-then
-    AC_MSG_ERROR([no lex or flex found])
-fi
 AM_PROG_AR
 PKG_PROG_PKG_CONFIG