Modernize spec file

perl-Devel-CheckLib.spec

@@ -38,21 +38,13 @@ and its headers are available.
 make %{?_smp_mflags}
 
 %install
-rm -rf $RPM_BUILD_ROOT
-
-make pure_install PERL_INSTALL_ROOT=$RPM_BUILD_ROOT
-
+make pure_install DESTDIR=$RPM_BUILD_ROOT
 find $RPM_BUILD_ROOT -type f -name .packlist -exec rm -f {} \;
-find $RPM_BUILD_ROOT -depth -type d -exec rmdir {} 2>/dev/null \;
-
 %{_fixperms} $RPM_BUILD_ROOT/*
 
 %check
 make test
 
-%clean
-rm -rf $RPM_BUILD_ROOT
-
 %files
 %doc CHANGES README
 %{_bindir}/*