Spec file modernization

rc.spec

@@ -15,7 +15,7 @@ Provides:         /bin/rc
 %endif
 Requires(post):   grep
 Requires(postun): sed
-BuildRequires:  gcc
+BuildRequires:    gcc
 BuildRequires:    readline-devel
 
 %description
@@ -28,11 +28,10 @@ This is a re-implementation for Unix, by Byron Rakitzis, of the Plan 9 shell.
 
 %build
 %configure --with-edit=gnu
-make %{?_smp_mflags}
+%make_build
 
 %install
-rm -rf $RPM_BUILD_ROOT
-make DESTDIR=$RPM_BUILD_ROOT INSTALL='install -p' install
+%make_install
 
 %check
 make check
@@ -54,7 +53,6 @@ if [ ! -x %{_bindir}/%{name} ]; then
 fi
 
 %files
-%{!?_licensedir:%global license %%doc}
 %license COPYING
 %doc ChangeLog AUTHORS EXAMPLES NEWS README
 %{_bindir}/%{name}