build: resolve SCHEME from $(JERBOA_HOME)/.chez/bin/scheme

Jaime Fournier <jaimef@linbsd.org>

af3f8712997f420ef3b7a65bccd92c367e96ba7f

diff --git a/Makefile b/Makefile
index 7488503..0e79aea 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
-SCHEME ?= scheme
-JERBOA ?= $(HOME)/jerboa/lib
+JERBOA_HOME ?= $(HOME)/mine/jerboa
+SCHEME ?= $(JERBOA_HOME)/.chez/bin/scheme
+JERBOA ?= $(JERBOA_HOME)/lib
 LIBDIRS = lib:$(JERBOA)
 
 .PHONY: all build test clean jdns jdns-data