From ed0754d4e7faf0aca9773e8fec9b70129a011fc7 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Tue, 27 Apr 2010 12:59:52 -0400
Subject: [PATCH] added check in Makefile for populated refptr directory

---
 Makefile | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 2018165..d09e61d 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,16 @@ DEPS     := $(CXXDEPS)
 OBJS     := $(CXXOBJS)
 LDFLAGS  := -lpcre
 
-all: $(TARGET)
+all: submodule_check $(TARGET)
+
+.PHONY: submodule_check
+submodule_check:
+	@if [ ! -e refptr/refptr.h ]; then \
+		echo Error: \"refptr\" folder is not populated.; \
+		echo Perhaps you forgot to do \"git checkout --recursive\"?; \
+		echo You can remedy the situation with \"git submodule update --init\".; \
+		exit 1; \
+	fi
 
 $(TARGET): $(OBJS)
 	$(CXX) -o $@ $^ $(LDFLAGS)