diff --git a/configure.ac b/configure.ac index f7319a15..992e2033 100644 --- a/configure.ac +++ b/configure.ac @@ -175,7 +175,10 @@ AC_SUBST([YACC_LIBRARY]) # Checks for programs. AM_MISSING_PROG([DOT], [dot]) AC_PROG_LEX -$LEX_IS_FLEX || AC_MSG_ERROR([Flex is required]) +$LEX_IS_FLEX || test "X$LEX" = X: || { + AC_MSG_WARN([bypassing lex because flex is required]) + LEX=: +} AC_PROG_YACC AC_PROG_RANLIB AC_PROG_GNU_M4