Forgot to put two spaces in the lines for the description.
Here's the proper patch, sorry about that.

On 2017-12-15 16:05, Rutger Helling wrote:

Thanks for reviewing! Here's an updated patch based on your feedback.

On 2017-12-15 15:16, ludo@gnu.org wrote:

Hello!

Rutger Helling <rhelling@mykolab.com> skribis:

From ccea9a6c9dd71aea5ef5c07802f7e376a7f86a96 Mon Sep 17 00:00:00 2001
From: Rutger Helling <rhelling@mykolab.com>
Date: Fri, 15 Dec 2017 11:58:10 +0100
Subject: [PATCH] gnu: virtualization: Add lookingglass.

* gnu/packages/virtualization.scm (lookingglass): New variable.

[...]

+(define-public lookingglass
+  (package
+   (name "lookingglass")

Please run:

  ./etc/indent-code.el gnu/packages/virtualization.scm lookingglass

+   (version "a5")
+   (source
+    (origin
+     (method url-fetch)
+     (uri (string-append "https://github.com/gnif/LookingGlass/archive/"
+                         version ".tar.gz"))
+     (file-name (string-append name "-" version))
+     (sha256
+      (base32
+       "0lrb821914fp27xaq0spwhbblssz55phiygvdlvcrkifa138v8pf"))))
+   (build-system gnu-build-system)
+   (inputs `(("fontconfig" ,fontconfig)
+             ("glu" ,glu)
+             ("mesa" ,mesa)
+             ("openssl" ,openssl)
+             ("sdl2" ,sdl2)
+             ("sdl2-ttf" ,sdl2-ttf)
+             ("spice-protocol" ,spice-protocol)))
+   (native-inputs `(("pkg-config", pkg-config)))
+   (arguments
+    `(#:tests? #f ;; No tests are available.
+      #:phases (modify-phases %standard-phases
+                 (replace 'configure
+                    (lambda* (#:key outputs #:allow-other-keys)
+                      (chdir "client")))

Return #t.

+                  (replace 'install
+                    (lambda* (#:key outputs #:allow-other-keys)
+                      (mkdir-p (string-append %output "/bin"))
+                      (copy-file "bin/looking-glass-client" (string-append
+                                 %output "/bin/looking-glass-client")))))))

Same here.

Use the 'outputs' argument instead of the '%output' global variable.

Also, you can replace the mkdir-p/copy-file pair with just:

  (install-file "bin/looking-glass-client"
                (string-append (assoc-ref outputs "out") "/bin"))

+   (home-page "https://looking-glass.hostfission.com")
+   (synopsis "Low-latency KVMFR implementation for QEMU guests with VGA PCI
+passthrough")
+   (description "LookingGlass is an extremely low latency KVMFR (KVM FrameRelay)
+implementation for QEMU guests with VGA PCI Passthrough.")

Could you shorten the synopsis and expound the description a little bit?
:-)  I find it hard to understand what this is about looking at this.

+   (license gpl2)))

AFAICS source file headers explicitly say "or any later version", so
this should be 'gpl2+'.

The rest LGTM.  Could you send an updated patch?

Thank you!

Ludo'.