diff -Naur z81-2.1-orig/Makefile z81-2.1/Makefile
--- z81-2.1-orig/Makefile	2004-10-02 00:05:44.000000000 +0300
+++ z81-2.1/Makefile	2006-06-06 00:32:25.000000000 +0300
@@ -26,7 +26,7 @@
 # it is, try `/usr/X11', that's a common culprit.) On Linux it's
 # generally here:
 #
-XROOT=/usr/X11R6
+XROOT=/usr
 
 # xz81 has a rather complicated routine to draw a pixel (scaling makes
 # it a bit non-trivial), which should be inlined by the compiler if
@@ -37,11 +37,11 @@
 
 # dest for make install
 #
-PREFIX=/usr/local
+PREFIX=/usr
 BINDIR=$(PREFIX)/bin
 XBINDIR=$(BINDIR)
-MANDIR=$(PREFIX)/man/man1
-LIBDIR=$(PREFIX)/lib/z81
+MANDIR=$(PREFIX)/share/man/man1
+LIBDIR=$(PREFIX)/share/z81
 
 # if you want the X version to be installed in the usual X executables
 # directory, uncomment this: