diff --git a/Makefile.am b/Makefile.am
index f84e74d1e..b6b69dfcc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,8 @@
 SUBDIRS = Include Lib Simulator Tools Tests
 
 EXTRA_DIST = README.Unix README.Linux README.MacOS README.Win32 \
-	README.autoconf README.running Thanks VERSION acsite.m4 acconfig.h
+	README.autoconf README.running Thanks VERSION acsite.m4 acconfig.h \
+	irix-hack.pl
 
 dist-hook:
 	tar cf - Hints | (cd $(distdir); tar xvf -)
diff --git a/README.Unix b/README.Unix
index 127508104..b5df61ca5 100644
--- a/README.Unix
+++ b/README.Unix
@@ -68,6 +68,16 @@ command:
 
   find . -name Makefile -exec irix-hack.pl {} \;
 
+This touches up the Makefiles to build libfoo.a with 
+
+  CC -ar -o libfoo.a file1.o file2.o ...
+
+The traditional method is to run:
+
+  ar cru libfoo.a file1.o file2.o
+
+I wonder if this means that the native SGI "ar" is somewhat broke?
+
 Note, you should make sure you have perl installed on your system.  The
 "irix-hack.pl" script assumes that perl is located in /usr/bin/perl so
 if this isn't the proper location on your system, change it in the first
@@ -78,3 +88,15 @@ if perl is on your system (and determine where) is to run:
 
 Perl can be installed from "eoe.sw.gifts_perl" or can be fetched and
 built from the net.
+
+Finally you should run Gnu make.  The native Irix make utility just
+can't handle the makefiles generated by the automake program.  Thus 
+you will need to use Gnu make.  It's called "gmake" on my system so I 
+just run:
+
+  gmake
+
+Don't worry about the make failing in the Tools directory.  That's all
+under construction stuff right now (3/9/99) and if you get that far, 
+rejoice because it means the simulator was successfully built in the 
+Simulator/Main subdirectory.
diff --git a/configure.in b/configure.in
index 2b4900df0..3d1ae7d25 100644
--- a/configure.in
+++ b/configure.in
@@ -336,6 +336,7 @@ AC_OUTPUT( \
 	Tools/Lib/DEM/Makefile \
 	Tools/Lib/Polygon/Makefile \
 	Tools/Prep/Makefile \
+	Tools/Prep/DemChop/Makefile \
 	Tools/Prep/DemInfo/Makefile \
 	Tools/Prep/DemRaw2ascii/Makefile \
 	Tools/Prep/GenAirports/Makefile \