From e4e14b207801027a4736decbdade446d8adaa2c4 Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Mon, 19 Oct 2015 15:43:06 -0700
Subject: [PATCH] Link with -lpthread

---
 Makefile | 2 +-
 tile.cc  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index c9e0d02..0ffc05f 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ INCLUDES = -I/usr/local/include
 LIBS = -L/usr/local/lib
 
 tippecanoe: geojson.o jsonpull.o vector_tile.pb.o tile.o clip.o pool.o mbtiles.o geometry.o projection.o memfile.o clipper/clipper.o
-	g++ $(PG) $(LIBS) -O3 -g -Wall -o $@ $^ -lm -lz -lprotobuf-lite -lsqlite3
+	g++ $(PG) $(LIBS) -O3 -g -Wall -o $@ $^ -lm -lz -lprotobuf-lite -lsqlite3 -lpthread
 
 enumerate: enumerate.o
 	gcc $(PG) $(LIBS) -O3 -g -Wall -o $@ $^ -lsqlite3
diff --git a/tile.cc b/tile.cc
index 71ee72c..811c49b 100644
--- a/tile.cc
+++ b/tile.cc
@@ -1034,7 +1034,7 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
 			args[thread].file_minzoom = minzoom;
 			args[thread].file_maxzoom = maxzoom;
 			args[thread].todo = todo;
-			args[thread].along = &along; // XXX locking
+			args[thread].along = &along; // locked with var_lock
 			args[thread].gamma = gamma;
 			args[thread].nlayers = nlayers;
 			args[thread].prevent = prevent;