Index: trunk/test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java	(revision 11660)
+++ trunk/test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java	(revision 11661)
@@ -63,4 +63,5 @@
 
     private static final String REFERENCE_DATA_FILE = "data_nodist/projection/projection-reference-data";
+    private static final String PROJ_LIB_DIR = "data_nodist/projection";
 
     private static class RefEntry {
@@ -233,4 +234,5 @@
         args.addAll(Arrays.asList(def.split(" ")));
         ProcessBuilder pb = new ProcessBuilder(args);
+        pb.environment().put("PROJ_LIB", new File(PROJ_LIB_DIR).getAbsolutePath());
 
         String output;