--- Makefile.orig	2015-05-18 19:48:09 UTC
+++ Makefile
@@ -36,12 +36,12 @@ MKC_DIR = ./mkconfig
 ###
 # installation options
 #
-prefix = /usr/local
+prefix ?= /usr/local
 LOCALEDIR = $(prefix)/share/locale
 PROG = di
 MPROG = mi
 #
-INSTALL_DIR = $(prefix)
+INSTALL_DIR = $(DESTDIR)$(prefix)
 INSTALL_BIN_DIR = $(INSTALL_DIR)/bin
 INST_LOCALEDIR = $(INSTALL_DIR)/share/locale
 TARGET = $(INSTALL_BIN_DIR)/$(PROG)$(EXE_EXT)
@@ -140,7 +140,7 @@ install-prog:
 	$(TEST) -d $(INSTALL_BIN_DIR) || $(MKDIR) $(INSTALL_BIN_DIR)
 	$(CP) -f ./$(FROMDIR)/$(PROG)$(EXE_EXT) $(TARGET)
 	-$(RM) -f $(MTARGET) > /dev/null 2>&1
-	-$(LN) -s $(PROG)$(EXE_EXT) $(MTARGET)
+	-( cd $(INSTALL_BIN_DIR) && $(LN) -s $(PROG)$(EXE_EXT) $(MPROG)$(EXE_EXT) )
 	@-test -f $(FROMDIR)/config.h && \
 		grep '^#define _enable_nls 1' $(FROMDIR)/config.h >/dev/null 2>&1 && \
 		(. ./$(FROMDIR)/di.env; $(MAKE) -e INST_LOCALEDIR="$(INST_LOCALEDIR)" \