From d7b14e6b696f1b58e2c2d50044b39831b646a876 Mon Sep 17 00:00:00 2001
From: Brian Callahan <ibara@users.noreply.github.com>
Date: Sat, 3 Aug 2019 18:33:59 -0400
Subject: [PATCH] Don't use GNU grep for OpenBSD package builds

Hi --

The -P flag is only available on GNU grep, not BSD grep. This causes package builds on OpenBSD to needlessly fail when running cmake.

We will only ever package tagged versions of Olive, so we'll all know what version of Olive we're using. If a user wants to build from the tip of the tree, then they'll have a .git directory and the fallback won't even happen.
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28acf2879..f23b8eed6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,7 +71,7 @@ if(EXISTS "${CMAKE_SOURCE_DIR}/.git")
       OUTPUT_STRIP_TRAILING_WHITESPACE
     )
   endif()
-elseif(UNIX AND NOT APPLE)
+elseif(UNIX AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
   # Fallback for Ubuntu/Launchpad (extracts Git hash from debian/changelog rather than Git repo)
   # (see https://answers.launchpad.net/launchpad/+question/678556)
   execute_process(COMMAND sh -c "grep -Po '(?<=-)(([a-z0-9])\\w+)(?=\\+)' -m 1 changelog"