gnu: Add blueprint-compiler.

* gnu/packages/gnome.scm (blueprint-compiler): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/gnome.scm

@@ -3192,6 +3192,31 @@ the GNOME desktop environment.")
                                 (variable "GLADE_MODULE_SEARCH_PATH")
                                 (files '("lib/glade/modules")))))))
 
+(define-public blueprint-compiler
+  (let ((commit "87cedc2c7e48b01dc1b07aef937e2fe02111b18c"))
+    (package
+      (name "blueprint-compiler")
+      (version "0.2.0")
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url
+                       "https://gitlab.gnome.org/jwestman/blueprint-compiler")
+                      (commit commit)))
+                (file-name (string-append name "-" commit "-checkout"))
+                (sha256
+                 (base32
+                  "1mrj5dyjf5d325yc28fpph588qfsz6bm2nx5nnsgcv02bagplxid"))))
+      (build-system meson-build-system)
+      (native-inputs (list gobject-introspection gtk))
+      (inputs (list python))
+      (synopsis "Template markup language")
+      (description
+       "Blueprint is a markup language for GTK user interfaces.  Internally, it
+compiles to GTKBuilder XML.")
+      (home-page "https://gitlab.gnome.org/jwestman/blueprint-compiler")
+      (license license:lgpl3+))))
+
 (define-public cambalache
   (package
    (name "cambalache")