From aa2929196dc29cfe0c84d00b9fd746be863e8b15 Mon Sep 17 00:00:00 2001
From: Oliver Jowett <oliver.jowett@flightaware.com>
Date: Wed, 5 Aug 2020 15:02:33 +0800
Subject: [PATCH] If DUMP1090_VERSION is unset, use "unknown" as the version
 (not an empty string)

---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 2285ac7..68ab4e0 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,8 @@ ifndef LIMESDR
   LIMESDR := $(shell pkg-config --exists LimeSuite && echo "yes" || echo "no")
 endif
 
+DUMP1090_VERSION ?= unknown
+
 CPPFLAGS += -DMODES_DUMP1090_VERSION=\"$(DUMP1090_VERSION)\" -DMODES_DUMP1090_VARIANT=\"dump1090-fa\"
 
 DIALECT = -std=c11