New formula: sxiv 1.0

Closes Homebrew/homebrew#16615.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/sxiv.rb

@@ -0,0 +1,51 @@
+require 'formula'
+
+class Sxiv < Formula
+  homepage 'https://github.com/muennich/sxiv'
+  url 'https://github.com/downloads/muennich/sxiv/sxiv-1.0.tar.gz'
+  sha1 'e29e33c38fd2a6c8a2cb3b270776859328aa8e0e'
+
+  head 'https://github.com/muennich/sxiv.git'
+
+  depends_on :x11
+  depends_on 'imlib2'
+  depends_on 'giflib' => :optional
+  depends_on 'libexif' => :optional
+
+  # Makefile uses GNU install
+  def patches; DATA; end
+
+  def install
+    system "make", "config.h"
+
+    if build.with? "giflib"
+      inreplace "config.h", "#define GIF_SUPPORT  0", "#define GIF_SUPPORT  1"
+    end
+
+    if build.with? "libexif"
+      inreplace "config.h", "#define EXIF_SUPPORT 0", "#define EXIF_SUPPORT 1"
+    end
+
+    system "make", "PREFIX=#{prefix}", "install"
+  end
+
+  test do
+    system "#{bin}/sxiv", "-v"
+  end
+end
+
+__END__
+diff --git a/Makefile b/Makefile
+index 32c644f..0cd8019 100644
+--- a/Makefile
++++ b/Makefile
+@@ -52,7 +52,8 @@ dist: clean
+ 
+ install: all
+ 	@echo "installing executable file to $(DESTDIR)$(PREFIX)/bin"
+-	@install -D -m 755 sxiv $(DESTDIR)$(PREFIX)/bin/sxiv
++	@install -d $(DESTDIR)$(PREFIX)/bin
++	@install -m 755 sxiv $(DESTDIR)$(PREFIX)/bin/sxiv
+ 	@echo "installing manual page to $(DESTDIR)$(MANPREFIX)/man1"
+ 	@mkdir -p $(DESTDIR)$(MANPREFIX)/man1
+ 	@sed "s/VERSION/$(VERSION)/g" sxiv.1 > $(DESTDIR)$(MANPREFIX)/man1/sxiv.1