Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -82,11 +82,11 @@
 	sed 's@  *@@g;s@..@0x&, @g' < nano.tcl.h.new.1 > nano.tcl.h.new.2
 	rm -f nano.tcl.h.new.1
 	mv nano.tcl.h.new.2 nano.tcl.h
 
 test: @EXTENSION_TARGET@ pkgIndex.tcl
-	@srcdir@/test/test.tcl --libpath . --libpath @TCLLIB_PATH@
+	@srcdir@/test/test.tcl --libpath . --libpath @TCLLIB_PATH@ --libpath @srcdir@/vendor/tcl-packages
 
 ifeq (@ENABLE_COVERAGE@,true)
 coverage.dir: test
 	rm -f nano-coverage.info
 	lcov --capture --directory . --output-file nano-coverage.info