direvent 5.1 (new formula)

Closes #4151.

Signed-off-by: Andrew Janke <janke@eilonwy.local>

Formula/direvent.rb

@@ -0,0 +1,20 @@
+class Direvent < Formula
+  desc "Monitors events in the file system directories"
+  homepage "http://www.gnu.org.ua/software/direvent/direvent.html"
+  url "https://ftpmirror.gnu.org/direvent/direvent-5.1.tar.gz"
+  mirror "https://ftp.gnu.org/gnu/direvent/direvent-5.1.tar.gz"
+  sha256 "c461600d24183563a4ea47c2fd806037a43354ea68014646b424ac797a959bdb"
+
+  def install
+    system "./configure", "--disable-dependency-tracking",
+                          "--disable-silent-rules",
+                          "--prefix=#{prefix}"
+    system "make"
+    system "make", "check"
+    system "make", "install"
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/direvent --version")
+  end
+end