--- a/Makefile	2026-10-18 06:53:27.760874286 +0200
+++ b/Makefile	2026-10-18 06:53:27.770961709 +0200
@@ -6,6 +6,10 @@ CXXFLAGS += -I/usr/X11R7/include/
 
 PLATFORM := platform/linux
 
+PREFIX ?= /usr
+LIBDIR ?= $(PREFIX)/lib64
+INCDIR ?= $(PREFIX)/include
+
 %.o: %.cpp
 	$(CXX) -c -fPIC -o $@ $< $(CXXFLAGS)
 
@@ -17,14 +21,14 @@ openglide.so: $(csources:.cpp=.o)
 
 .PHONY: install
 install: openglide.so
-	install -d /usr/include/glide2/
-	install -m 644 sdk2/3dfx.h /usr/include/glide2/
-	install -m 644 sdk2/glide.h /usr/include/glide2/
-	install -m 644 sdk2/glidesys.h /usr/include/glide2/
-	install -m 644 sdk2/glideutl.h /usr/include/glide2/
-	install -m 644 sdk2/sst1vid.h /usr/include/glide2/
-	install -m 644 -T openglide.so /usr/lib64/libglide.so.2 
-	ln -f /usr/lib64/libglide.so.2 /usr/lib64/libglide2x.so 
+	install -d $(DESTDIR)$(INCDIR)/glide2/ $(DESTDIR)$(LIBDIR)/
+	install -m 644 sdk2/3dfx.h $(DESTDIR)$(INCDIR)/glide2/
+	install -m 644 sdk2/glide.h $(DESTDIR)$(INCDIR)/glide2/
+	install -m 644 sdk2/glidesys.h $(DESTDIR)$(INCDIR)/glide2/
+	install -m 644 sdk2/glideutl.h $(DESTDIR)$(INCDIR)/glide2/
+	install -m 644 sdk2/sst1vid.h $(DESTDIR)$(INCDIR)/glide2/
+	install -m 644 -T openglide.so $(DESTDIR)$(LIBDIR)/libglide.so.2 
+	ln -f $(DESTDIR)$(LIBDIR)/libglide.so.2 $(DESTDIR)$(LIBDIR)/libglide2x.so 
 
 .PHONY: clean
 clean: