--- a/build/makefile	2021-02-04 15:24:38.488425167 +0900
+++ b/build/makefile	2021-02-04 15:25:26.053775490 +0900
@@ -61,7 +61,7 @@
 # Environment for running rDock unit tests
 export RBT_ROOT	= ../
 export RBT_HOME	= ./test/RBT_HOME
-export LD_LIBRARY_PATH = ../lib
+export LD_LIBRARY_PATH = $(shell echo $$LD_LIBRARY_PATH):../lib
 
 ##################################################
 # Main rDock build targets