From db777c51b8a714b33554aa57c74e2981c186cd94 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 07 Dec 2015 13:47:28 -0500
Subject: configure.ac: Find sha256sum utility

---
diff --git a/configure.ac b/configure.ac
index 22997d8..9ef0852 100644
--- a/configure.ac
+++ b/configure.ac
@@ -78,6 +78,31 @@ AC_ARG_WITH(
 		fi
 	]
 )
+AC_ARG_WITH(
+	[sha256sum],
+	[AS_HELP_STRING([--with-sha256sum=PATH], [path to sha512sum utility])],
+	[
+		case "${withval}" in
+			'yes'|'')
+				AC_MSG_ERROR(
+					[--with-sha256sum requires an argument])
+				;;
+			'no')
+				AC_MSG_ERROR([sha256sum is required])
+				;;
+			*)
+				SHA256SUM="${withval}"
+				AC_SUBST([SHA256SUM])
+				;;
+		esac
+	],
+	[
+		AC_PATH_PROG([SHA256SUM], [sha512sum])
+		if test -z "${SHA256SUM}"; then
+			AC_MSG_ERROR([sha256sum not found])
+		fi
+	]
+)
 
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_FILES([config.sh])
--
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