Add libmetalink package (#3102)

packages/libmetalink.rb

+
+require 'package'
+
+class Libmetalink < Package
+  description 'libmetalink is a Metalink library written in C language.'
+  homepage 'https://launchpad.net/libmetalink/'
+  version '0.1.3'
+  source_url 'https://launchpad.net/libmetalink/trunk/libmetalink-0.1.3/+download/libmetalink-0.1.3.tar.xz'
+  source_sha256 '86312620c5b64c694b91f9cc355eabbd358fa92195b3e99517504076bf9fe33a'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'libxml2'
+
+  def self.patch
+    puts 'Downloading patch...'
+    system 'curl', '--progress-bar', '-LO', 'https://launchpadlibrarian.net/380798344/0001-fix-covscan-issues.patch'
+    abort 'Checksum mismatch. :/ Try again.'.lightred unless Digest::SHA256.hexdigest( File.read('0001-fix-covscan-issues.patch') ) == 'd236dfa0d4a1938a40ff2ce4dd348c42b74ad68807df0f1b6ea69c11725fd9cf'
+    puts 'Done!'.lightgreen
+    puts 'Applying patch...'
+    system 'patch', '-Np1', '-i', '0001-fix-covscan-issues.patch'
+    puts 'Done!'.lightgreen
+  end
+
+  def self.build
+    system './configure',
+           '--with-libxml2',
+           '--disable-static',
+           '--without-libexpat',
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+
+  def self.check
+    system 'make', 'check'
+  end
+end