diff --git a/byacc.spec b/byacc.spec
index f38b167..02145d9 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -7,7 +7,7 @@ Release: 1%{?dist}
 License: Public Domain
 Group: Development/Tools
 URL: http://dickey.his.com/byacc/byacc.html
-Source: ftp://invisible-island.net/byacc/byacc-20050813.tgz
+Source: ftp://invisible-island.net/byacc/byacc-%{byaccdate}.tgz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 %description
@@ -22,13 +22,15 @@ this package.
 
 %build
 %configure --disable-dependency-tracking
-make
+make %{?_smp_mflags}
 
 %install
 rm -rf $RPM_BUILD_ROOT
 make DESTDIR=$RPM_BUILD_ROOT install
-ln -s yacc $RPM_BUILD_ROOT/usr/bin/byacc
+ln -s yacc $RPM_BUILD_ROOT/%{_bindir}/byacc
 ln -s yacc.1 $RPM_BUILD_ROOT/%{_mandir}/man1/byacc.1
+install -d $RPM_BUILD_ROOT/%{_docdir}/%{name}-%{version}/
+install -m 644 ACKNOWLEDGEMENTS CHANGES README NEW_FEATURES $RPM_BUILD_ROOT/%{_docdir}/%{name}-%{version}/
 
 %check
 echo ====================TESTING=========================
@@ -39,9 +41,10 @@ echo ====================TESTING END=====================
 rm -rf $RPM_BUILD_ROOT
 
 %files
+%doc ACKNOWLEDGEMENTS CHANGES README NEW_FEATURES
 %defattr(-,root,root)
-/usr/bin/yacc
-/usr/bin/byacc
+%{_bindir}/yacc
+%{_bindir}/byacc
 %{_mandir}/man1/yacc.1*
 %{_mandir}/man1/byacc.1*