From d5d91031d4f89f5eaf71a3c79fdb6630b9624a85 Mon Sep 17 00:00:00 2001
From: albert-github <albert.tests@gmail.com>
Date: Sat, 29 Jun 2019 11:01:34 +0200
Subject: issue #7091 HEAD fails to build on macOS with stock `bison`

Placed minimum `bison` requirement.

Tested with bison version 2.7 so used this as minimum.

Note: win_flex_bison  uses a different external numbering. The e.g. the version 2.5.16 of win_flex_bison contains bison version 3.0.4.
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dcd426b..7ee9d7e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,6 +83,9 @@ find_program(DOT NAMES dot)
 find_package(PythonInterp REQUIRED)
 find_package(FLEX REQUIRED)
 find_package(BISON REQUIRED)
+if (BISON_VERSION VERSION_LESS 2.7)
+  message(SEND_ERROR "Doxygen requires at least bison version 2.7 (installed: ${BISON_VERSION})")
+endif()
 find_package(Threads)
 
 if (sqlite3)
-- 
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