diff --git a/Makefile.in b/Makefile.in
index 6a5e3fd90..a603a5996 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -223,40 +223,40 @@ install: all installdirs $(libdir)/ivl/ivl@EXEEXT@  $(libdir)/ivl/include/consta
 	    do (cd $$dir ; $(MAKE) $@); done
 
 $(bindir)/iverilog-vpi: ./iverilog-vpi
-	$(INSTALL_SCRIPT) ./iverilog-vpi $(bindir)/iverilog-vpi
+	$(INSTALL_SCRIPT) ./iverilog-vpi $(DESTDIR)$(bindir)/iverilog-vpi
 
 $(libdir)/ivl/ivl@EXEEXT@: ./ivl@EXEEXT@
-	$(INSTALL_PROGRAM) ./ivl@EXEEXT@ $(libdir)/ivl/ivl@EXEEXT@
+	$(INSTALL_PROGRAM) ./ivl@EXEEXT@ $(DESTDIR)$(libdir)/ivl/ivl@EXEEXT@
 
 $(libdir)/ivl/include/constants.vams: $(srcdir)/constants.vams
 	$(INSTALL_DATA) $(srcdir)/constants.vams $@
 
 $(libdir)/ivl/xnf-s.conf: $(srcdir)/xnf-s.conf
-	$(INSTALL_DATA) $(srcdir)/xnf-s.conf $(libdir)/ivl/xnf-s.conf
+	$(INSTALL_DATA) $(srcdir)/xnf-s.conf $(DESTDIR)$(libdir)/ivl/xnf-s.conf
 
 $(libdir)/ivl/xnf.conf: $(srcdir)/xnf.conf
-	$(INSTALL_DATA) $(srcdir)/xnf.conf $(libdir)/ivl/xnf.conf
+	$(INSTALL_DATA) $(srcdir)/xnf.conf $(DESTDIR)$(libdir)/ivl/xnf.conf
 
 $(includedir)/ivl_target.h: $(srcdir)/ivl_target.h
-	$(INSTALL_DATA) $(srcdir)/ivl_target.h $(includedir)/ivl_target.h
+	$(INSTALL_DATA) $(srcdir)/ivl_target.h $(DESTDIR)$(includedir)/ivl_target.h
 
 $(includedir)/_pli_types.h: _pli_types.h
-	$(INSTALL_DATA) $< $(includedir)/_pli_types.h
+	$(INSTALL_DATA) $< $(DESTDIR)$(includedir)/_pli_types.h
 
 $(includedir)/vpi_user.h: $(srcdir)/vpi_user.h
-	$(INSTALL_DATA) $(srcdir)/vpi_user.h $(includedir)/vpi_user.h
+	$(INSTALL_DATA) $(srcdir)/vpi_user.h $(DESTDIR)$(includedir)/vpi_user.h
 
 $(includedir)/acc_user.h: $(srcdir)/acc_user.h
-	$(INSTALL_DATA) $(srcdir)/acc_user.h $(includedir)/acc_user.h
+	$(INSTALL_DATA) $(srcdir)/acc_user.h $(DESTDIR)$(includedir)/acc_user.h
 
 $(includedir)/veriuser.h: $(srcdir)/veriuser.h
-	$(INSTALL_DATA) $(srcdir)/veriuser.h $(includedir)/veriuser.h
+	$(INSTALL_DATA) $(srcdir)/veriuser.h $(DESTDIR)$(includedir)/veriuser.h
 
 $(mandir)/man1/iverilog-vpi.1: $(srcdir)/iverilog-vpi.man
-	$(INSTALL_DATA) $(srcdir)/iverilog-vpi.man $(mandir)/man1/iverilog-vpi.1
+	$(INSTALL_DATA) $(srcdir)/iverilog-vpi.man $(DESTDIR)$(mandir)/man1/iverilog-vpi.1
 
 $(prefix)/iverilog-vpi.pdf: iverilog-vpi.pdf
-	$(INSTALL_DATA) iverilog-vpi.pdf $(prefix)/iverilog-vpi.pdf
+	$(INSTALL_DATA) iverilog-vpi.pdf $(DESTDIR)$(prefix)/iverilog-vpi.pdf
 
 # In windows installations, put a few examples and the quick_start
 # into the destination directory.
@@ -279,22 +279,22 @@ $(prefix)/QUICK_START.txt: $(srcdir)/QUICK_START.txt
 endif
 
 installdirs: mkinstalldirs
-	$(srcdir)/mkinstalldirs $(bindir) $(includedir) $(libdir)/ivl \
-	    $(libdir)/ivl/include $(mandir) $(mandir)/man1
+	$(srcdir)/mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(includedir) $(DESTDIR)$(libdir)/ivl \
+	    $(DESTDIR)$(libdir)/ivl/include $(DESTDIR)$(mandir) $(DESTDIR)$(mandir)/man1
 
 uninstall:
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) $@); done
 	for dir in vpi ivlpp driver; \
 	    do (cd $$dir ; $(MAKE) $@); done
 	for f in xnf.conf xnf-s.conf ivl@EXEEXT@ include/constants.vams; \
-	    do rm -f $(libdir)/ivl/$$f; done
-	-rmdir $(libdir)/ivl/include
-	-rmdir $(libdir)/ivl
+	    do rm -f $(DESTDIR)$(libdir)/ivl/$$f; done
+	-rmdir $(DESTDIR)$(libdir)/ivl/include
+	-rmdir $(DESTDIR)$(libdir)/ivl
 	for f in verilog iverilog-vpi gverilog@EXEEXT@; \
-	    do rm -f $(bindir)/$$f; done
+	    do rm -f $(DESTDIR)$(bindir)/$$f; done
 	for f in ivl_target.h vpi_user.h _pli_types.h acc_user.h veriuser.h; \
-	    do rm -f $(includedir)/$$f; done
-	rm -f $(mandir)/man1/iverilog-vpi.1 $(prefix)/iverilog-vpi.pdf
+	    do rm -f $(DESTDIR)$(includedir)/$$f; done
+	rm -f $(DESTDIR)$(mandir)/man1/iverilog-vpi.1 $(DESTDIR)$(prefix)/iverilog-vpi.pdf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/verilog.spec b/verilog.spec
index f0f017a29..2676cab14 100644
--- a/verilog.spec
+++ b/verilog.spec
@@ -1,10 +1,15 @@
+#norootforbuild
+#
+%define rev_date 20080429
+#
+#
 Summary: Icarus Verilog
 Name: verilog
-Version: 0.9.0.20080429
+Version: 0.9.0.%{rev_date}
 Release: 0
 License: GPL
 Group: Productivity/Scientific/Electronics
-Source: verilog-20080429.tar.gz
+Source: verilog-%{rev_date}.tar.gz
 URL: http://www.icarus.com/eda/verilog/index.html
 Packager: Stephen Williams <steve@icarus.com>
 
@@ -22,14 +27,14 @@ engineering formats, including simulation. It strives to be true
 to the IEEE-1364 standard.
 
 %prep
-%setup -n verilog-20080429
+%setup -n verilog-%{rev_date}
 
 %build
-./configure --prefix=/usr --mandir='$(prefix)/share/man'
+%{configure}
 make CXXFLAGS=-O
 
 %install
-make prefix=$RPM_BUILD_ROOT/usr install
+%{makeinstall}
 
 %clean
 rm -rf $RPM_BUILD_ROOT
@@ -39,35 +44,35 @@ rm -rf $RPM_BUILD_ROOT
 %attr(-,root,root) %doc COPYING README.txt BUGS.txt QUICK_START.txt ieee1364-notes.txt mingw.txt swift.txt netlist.txt t-dll.txt vpi.txt xnf.txt tgt-fpga/fpga.txt cadpli/cadpli.txt xilinx-hint.txt
 %attr(-,root,root) %doc examples/*
 
-%attr(-,root,root) /usr/share/man/man1/iverilog.1.gz
+%attr(-,root,root) %{_mandir}/man1/iverilog.1.gz
 #%attr(-,root,root) /usr/man/man1/iverilog-fpga.1.gz
-%attr(-,root,root) /usr/share/man/man1/iverilog-vpi.1.gz
-%attr(-,root,root) /usr/share/man/man1/vvp.1.gz
+%attr(-,root,root) %{_mandir}/man1/iverilog-vpi.1.gz
+%attr(-,root,root) %{_mandir}/man1/vvp.1.gz
 
-%attr(-,root,root) /usr/bin/iverilog
-%attr(-,root,root) /usr/bin/iverilog-vpi
-%attr(-,root,root) /usr/bin/vvp
-%attr(-,root,root) /usr/lib/ivl/ivl
-%attr(-,root,root) /usr/lib/ivl/ivlpp
-%attr(-,root,root) /usr/lib/ivl/null.tgt
-%attr(-,root,root) /usr/lib/ivl/null.conf
-%attr(-,root,root) /usr/lib/ivl/null-s.conf
-%attr(-,root,root) /usr/lib/ivl/stub.tgt
-%attr(-,root,root) /usr/lib/ivl/stub.conf
-%attr(-,root,root) /usr/lib/ivl/stub-s.conf
-%attr(-,root,root) /usr/lib/ivl/vvp.tgt
-%attr(-,root,root) /usr/lib/ivl/vvp.conf
-%attr(-,root,root) /usr/lib/ivl/vvp-s.conf
-#%attr(-,root,root) /usr/lib/ivl/fpga.tgt
-#%attr(-,root,root) /usr/lib/ivl/fpga.conf
-#%attr(-,root,root) /usr/lib/ivl/fpga-s.conf
-#%attr(-,root,root) /usr/lib/ivl/xnf.conf
-#%attr(-,root,root) /usr/lib/ivl/xnf-s.conf
-%attr(-,root,root) /usr/lib/ivl/system.sft
-%attr(-,root,root) /usr/lib/ivl/system.vpi
-%attr(-,root,root) /usr/lib/ivl/cadpli.vpl
-%attr(-,root,root) /usr/lib/libvpi.a
-%attr(-,root,root) /usr/lib/libveriuser.a
+%attr(-,root,root) %{_bindir}/iverilog
+%attr(-,root,root) %{_bindir}/iverilog-vpi
+%attr(-,root,root) %{_bindir}/vvp
+%attr(-,root,root) %{_libdir}/ivl/ivl
+%attr(-,root,root) %{_libdir}/ivl/ivlpp
+%attr(-,root,root) %{_libdir}/ivl/null.tgt
+%attr(-,root,root) %{_libdir}/ivl/null.conf
+%attr(-,root,root) %{_libdir}/ivl/null-s.conf
+%attr(-,root,root) %{_libdir}/ivl/stub.tgt
+%attr(-,root,root) %{_libdir}/ivl/stub.conf
+%attr(-,root,root) %{_libdir}/ivl/stub-s.conf
+%attr(-,root,root) %{_libdir}/ivl/vvp.tgt
+%attr(-,root,root) %{_libdir}/ivl/vvp.conf
+%attr(-,root,root) %{_libdir}/ivl/vvp-s.conf
+#%attr(-,root,root) %{_libdir}/ivl/fpga.tgt
+#%attr(-,root,root) %{_libdir}/ivl/fpga.conf
+#%attr(-,root,root) %{_libdir}/ivl/fpga-s.conf
+#%attr(-,root,root) %{_libdir}/ivl/xnf.conf
+#%attr(-,root,root) %{_libdir}/ivl/xnf-s.conf
+%attr(-,root,root) %{_libdir}/ivl/system.sft
+%attr(-,root,root) %{_libdir}/ivl/system.vpi
+%attr(-,root,root) %{_libdir}/ivl/cadpli.vpl
+%attr(-,root,root) %{_libdir}/libvpi.a
+%attr(-,root,root) %{_libdir}/libveriuser.a
 %attr(-,root,root) /usr/include/ivl_target.h
 %attr(-,root,root) /usr/include/vpi_user.h
 %attr(-,root,root) /usr/include/acc_user.h