src/arith.y was deleted by commit f6e3b2 [ARITH] Add assignment and intmax_t 
support.
We can delete AC_PROG_YACC to get rid of the build-time dependency.
>From 1d173d31dcc971f3dc6e233d04498adc41b7326c Mon Sep 17 00:00:00 2001
From: Fangrui Song <[email protected]>
Date: Thu, 10 Oct 2019 16:30:42 +0000
Subject: [PATCH] build: delete AC_PROG_YACC
To: [email protected]

---
 configure.ac | 1 -
 1 file changed, 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 036730d..5dab5aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,6 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)])
 dnl Checks for programs.
 AC_PROG_CC
 AC_USE_SYSTEM_EXTENSIONS
-AC_PROG_YACC
 
 AC_MSG_CHECKING([for build system compiler])
 if test "$cross_compiling" = yes; then
-- 
2.23.0

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