diff -rupN ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58/database/builder/makedb.sh ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58-new/database/builder/makedb.sh
--- ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58/database/builder/makedb.sh	2022-11-01 15:39:55.000000000 +0100
+++ ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58-new/database/builder/makedb.sh	2022-12-19 16:00:58.713522467 +0100
@@ -4,16 +4,18 @@ set -e
 
 g++ builder.cpp --std=c++11 -o builder -lshp
 
-rm -rf out naturalearth timezone db.zip
+rm -rf out db.zip
 mkdir -p out
 mkdir -p out_v1
 mkdir -p naturalearth
 mkdir -p timezone
 
-(
-echo https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/ne_10m_admin_0_countries_lakes.zip -o /dev/null -O naturalearth/ne.zip
-echo https://github.com/evansiroky/timezone-boundary-builder/releases/download/2022f/timezones-with-oceans.shapefile.zip -o /dev/null -O timezone/tz.zip
-) | xargs -n5 -P2 wget
+if [ ! -e naturalearth/ne.zip ]; then
+    wget https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/ne_10m_admin_0_countries_lakes.zip -o /dev/null -O naturalearth/ne.zip
+fi
+if [ ! -e timezone/tz.zip ]; then
+    wget https://github.com/evansiroky/timezone-boundary-builder/releases/download/2022f/timezones-with-oceans.shapefile.zip -o /dev/null -O timezone/tz.zip
+fi
 
 cd naturalearth
 unzip ne.zip
Binary files ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58/database/builder/naturalearth/ne.zip and ZoneDetect-c65bc88db5338daada5b1362a1181aa6e6a4ab58-new/database/builder/naturalearth/ne.zip differ