diff --git a/src/Makefile b/src/Makefile
index 6f017ce..b3fd97e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -7,6 +7,8 @@ MACSDL = ~/Library/Frameworks/SDL2.framework/Versions/A/Headers
 TARGET = mtsedit
 SRCS = $(filter-out bin2h.c,$(wildcard *.c))
 OBJS = $(SRCS:.c=.o)
+PREFIX ?= usr/
+INSTDIR=$(DESTDIR:/=)/$(PREFIX:/=)
 
 # MacOSX
 ifneq ("$(wildcard $(MACSDL)/SDL.h)","")
@@ -71,11 +73,11 @@ $(TARGET): $(OBJS)
 	$(CC) $(LIBDIRS) $(OBJS) -o $(TARGET) $(LIBS)
 
 install: $(TARGET)
-	install -m 755 -g bin $(TARGET) /usr/bin
-	@mkdir -p /usr/share/mtsedit
-	cp ../data/* /usr/share/mtsedit
-	cp ../etc/mtsedit.desktop /usr/share/applications
-	cp ../etc/mtsedit.png /usr/share/icons/hicolor/32x32/apps
+	install -m 755 -g bin $(TARGET) $(INSTDIR)/bin
+	@mkdir -p $(INSTDIR)/share/mtsedit
+	cp ../data/* $(INSTDIR)/share/mtsedit
+	cp ../etc/mtsedit.desktop $(INSTDIR)/share/applications
+	cp ../etc/mtsedit.png $(INSTDIR)/share/icons/hicolor/32x32/apps
 
 package:
 ifeq ("$(PACKAGE)","Linux")