build: fix VPATH issue

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index 40446b7198ca46727ba90d32d90379902c395690..178b8fa992e8d7428e4939f50a54c16c96cab011 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -146,6 +146,7 @@ b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
 m4_define([b4_shared_declarations],
 [b4_percent_code_get([[requires]])[
 ]b4_parse_assert_if([# include <cassert>])[
+# include <cstdlib>  // abort
 # include <vector>
 # include <iostream>
 # include <stdexcept>