diff --git a/Makefile b/Makefile
index 75a40a3..b9e2817 100644
--- a/Makefile
+++ b/Makefile
@@ -109,8 +109,8 @@ install-bin:
 	for binfile in bin/*.rb ; do \
 		BINFILE=`basename $$binfile |sed -e 's/.rb$$//'`; \
 		install -D -o root -g root -m 755 $$binfile $(BINDIR)/$$BINFILE; \
-		sed -i -e 's|^QASIM_INCLUDE_DIR.*|QASIM_INCLUDE_DIR = "/usr/share/$(NAME)/lib"|' $(BINDIR)/$$BINFILE; \
-		sed -i -e 's|^QASIM_DATA_DIR.*|QASIM_DATA_DIR = "/usr/share/$(NAME)"|' $(BINDIR)/$$BINFILE; \
+		sed -i -e 's|^QASIM_INCLUDE_DIR.*|QASIM_INCLUDE_DIR = "$(SHAREDIR)/$(NAME)/lib"|' $(BINDIR)/$$BINFILE; \
+		sed -i -e 's|^QASIM_DATA_DIR.*|QASIM_DATA_DIR = "$(SHAREDIR)/$(NAME)"|' $(BINDIR)/$$BINFILE; \
 	done
 	#install -D -o root -g root -m 755 $(CURDIR)/bin/$(NAME)-gui.rb $(BINDIR)/$(NAME)-gui
 
@@ -166,8 +166,8 @@ install-data:
 
 ## OTHER
 
-.PHONY: destdir
-destdir:
-	rm -fr destdir
-	fakeroot $(MAKE) install DESTDIR=destdir
+.PHONY: tmp/destdir
+dev-install:
+	rm -fr tmp/destdir
+	fakeroot $(MAKE) install DESTDIR=tmp/destdir