Specify all explicitly-used build requirements

Also, remove some legacy cruft
- Drop Group: tag
- Drop explicit buildroot cleaning in %install section

perl-Digest-MD4.spec

@@ -1,21 +1,24 @@
 Name:		perl-Digest-MD4
 Version:	1.9
-Release:	16%{?dist}
+Release:	17%{?dist}
 Summary:	Perl interface to the MD4 Algorithm
-Group:		Development/Libraries
 License:	GPL+ or Artistic
 URL:		http://search.cpan.org/dist/Digest-MD4/
 Source0:	http://search.cpan.org/CPAN/authors/id/M/MI/MIKEM/DigestMD4/Digest-MD4-%{version}.tar.gz
 # Module Build
+BuildRequires:	coreutils
+BuildRequires:	findutils
+BuildRequires:	gcc
+BuildRequires:	gdbm-devel
 %if 0%{?fedora} > 13 || 0%{?rhel} > 6
 BuildRequires:	libdb-devel
 %else
 BuildRequires:	db4-devel
 %endif
-BuildRequires:	gdbm-devel
+BuildRequires:	make
-BuildRequires:	perl-interpreter
 BuildRequires:	perl-devel
 BuildRequires:	perl-generators
+BuildRequires:	perl-interpreter
 BuildRequires:	perl(Config)
 BuildRequires:	perl(ExtUtils::MakeMaker)
 # Module Runtime
@@ -47,11 +50,10 @@ perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags}"
 make %{?_smp_mflags}
 
 %install
-rm -rf %{buildroot}
 make pure_install DESTDIR=%{buildroot}
 find %{buildroot} -type f -name .packlist -delete
 find %{buildroot} -type f -name '*.bs' -empty -delete
-%{_fixperms} %{buildroot}
+%{_fixperms} -c %{buildroot}
 
 %check
 make test
@@ -63,6 +65,13 @@ make test
 %{_mandir}/man3/Digest::MD4.3*
 
 %changelog
+* Tue Feb 20 2018 Paul Howarth <paul@city-fan.org> - 1.9-17
+- Specify all explicitly-used build requirements
+- Remove some legacy cruft
+  - Drop BuildRoot: and Group: tags
+  - Drop explicit %%clean section
+  - Drop explicit buildroot cleaning in %%install section
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.9-16
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild