gnu: Add cura-engine.

* gnu/packages/engineering.scm (cura-engine): New variable.

Co-authored-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/packages/engineering.scm

@@ -127,6 +127,7 @@ (define-module (gnu packages engineering)
   #:use-module (gnu packages ruby)
   #:use-module (gnu packages serialization)
   #:use-module (gnu packages sqlite)
+  #:use-module (gnu packages stb)
   #:use-module (gnu packages swig)
   #:use-module (gnu packages tbb)
   #:use-module (gnu packages tcl)
@@ -3289,3 +3290,45 @@ (define-public libarcus
 messages based on the Protocol Buffers library.  It is designed to
 facilitate the communication between Cura and its backend and similar code.")
     (license license:lgpl3+)))
+
+(define-public cura-engine
+  (package
+    (name "cura-engine")
+    (version "4.13.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+               (url "https://github.com/Ultimaker/CuraEngine")
+               (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0xp2r0m5wwfsh9wdb3biqzvfqfz5jsmyw4bww93aksw0rgli07bp"))))
+    (build-system cmake-build-system)
+    (native-inputs
+     (list googletest pkg-config))
+    (inputs
+     (list libarcus protobuf stb-image))
+    (arguments
+     `(#:configure-flags '("-DBUILD_TESTS=ON")
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'fix-paths
+           (lambda* (#:key inputs #:allow-other-keys)
+             (substitute* "../source/cmake/FindStb.cmake"
+               (("/usr/include")
+                (string-append (assoc-ref inputs "stb-image")
+                               "/include"))
+               (("stb/stb_image_resize.h")
+                "stb_image.h"))
+             (substitute*
+                 "../source/src/infill/ImageBasedDensityProvider.cpp"
+               (("stb/stb_image.h")
+                "stb_image.h")))))))
+    (home-page "https://github.com/Ultimaker/CuraEngine")
+    (synopsis "Cura slicing engine")
+    (description "CuraEngine is a powerful, fast and robust engine for
+processing 3D models into 3D printing instruction for Ultimaker and other
+GCode based 3D printers.  It is part of the larger open source project called
+Cura.")
+    (license license:agpl3+)))