gnu: Add librnd.

* gnu/packages/engineering.scm (librnd): New variable.

gnu/packages/engineering.scm

@@ -420,6 +420,45 @@ (define-public lepton-eda
 and digital simulation, and printed circuit board (PCB) layout, and many other
 features.")))
 
+(define-public librnd
+  (package
+    (name "librnd")
+    (version "4.0.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://www.repo.hu/projects/librnd/releases/"
+                                  "librnd-" version ".tar.bz2"))
+              (sha256
+               (base32
+                "1fqh7gf9imhghlfajrsgzjx61mynfmdasciwpcajk7pn85d4ymql"))))
+    (build-system gnu-build-system)
+    (arguments
+     (list
+      #:tests? #false                   ;no check target
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'cc-is-gcc
+            (lambda _ (setenv "CC" "gcc")))
+          (replace 'configure
+            ;; The configure script doesn't tolerate most of our configure flags.
+            (lambda _
+              (invoke "sh" "configure"
+                      (string-append "--prefix=" #$output)))))))
+    (inputs
+     (list gd gtk glib glu))
+    (native-inputs
+     (list pkg-config))
+    (home-page "http://repo.hu/projects/librnd/")
+    (synopsis "Two-dimensional CAD engine")
+    (description "This is a flexible, modular two-dimensional CAD engine
+@itemize
+@item with transparent multiple GUI toolkit support;
+@item a flexible, dynamic menu system;
+@item a flexible, dynamic configuration system; and
+@item support for user scripting in a dozen languages.
+@end itemize")
+    (license license:gpl2+)))
+
 (define-public pcb
   (package
     (name "pcb")