diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index e3e346b1e9..190632436b 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -2538,53 +2538,52 @@ official SDK.")
 
 (define-public openctm
   (let ((revision 603))
-    ; Previous versions don't compile, they need to link libGL and libGLU.
-    ; Fixed in this revision.
+    ;; Previous versions don't compile, they need to link libGL and libGLU.
+    ;; Fixed in this revision.
     (package
       (name "openctm")
-      (version (number->string revision))
+      (version (string-append "1.0.3." (number->string revision)))
       (source
-        (origin
-          (method svn-fetch)
-          (uri
-            (svn-reference
-              (url "https://svn.code.sf.net/p/openctm/code/trunk")
-              (revision revision)))
-          (sha256
-            (base32 "01wb70m48xh5gwhv60a5brv4sxl0i0rh038w32cgnlxn5x86s9f1"))))
+       (origin
+         (method svn-fetch)
+         (uri (svn-reference
+               (url "https://svn.code.sf.net/p/openctm/code/trunk")
+               (revision revision)))
+         (file-name (string-append name "-" version "-checkout"))
+         (sha256
+          (base32 "01wb70m48xh5gwhv60a5brv4sxl0i0rh038w32cgnlxn5x86s9f1"))))
       (build-system gnu-build-system)
       (native-inputs
-        `(("mesa" ,mesa)
-          ("glu" ,glu)
-          ("glut" ,freeglut)
-          ("gtk" ,gtk+-2)
-          ("pkg-config" ,pkg-config)))
+       `(("mesa" ,mesa)
+         ("glu" ,glu)
+         ("glut" ,freeglut)
+         ("gtk" ,gtk+-2)
+         ("pkg-config" ,pkg-config)))
       (arguments
-        `(#:tests? #f
-          #:phases
-          (modify-phases
-            %standard-phases
-            (replace
-              'configure
-              (lambda* (#:key outputs #:allow-other-keys)
-                (rename-file "Makefile.linux" "Makefile") ; Use linux Makefile
-                (let ((out (assoc-ref outputs "out")))
-                  ; Create output directories
-                  (mkdir-p (string-append out "/lib"))
-                  (mkdir-p (string-append out "/include"))
-                  (mkdir-p (string-append out "/bin"))
-                  ; Fix rpath
-                  (substitute* "tools/Makefile.linux"
-                               (("-rpath,\\.")
-                                (string-append "-rpath," out "/lib/"))
-                               (("\\/usr\\/local")
-                                out))
-                  ; Set right output
-                  (substitute* "Makefile"
-                               (("\\/usr\\/lib")
-                                (string-append out "/lib"))
-                               (("\\/usr\\/local")
-                                out))))))))
+       `(#:tests? #f                              ;no tests
+         #:phases
+         (modify-phases %standard-phases
+           (replace 'configure
+             (lambda* (#:key outputs #:allow-other-keys)
+               (rename-file "Makefile.linux" "Makefile")
+               (let ((out (assoc-ref outputs "out")))
+                 ;; Create output directories.
+                 (mkdir-p (string-append out "/lib"))
+                 (mkdir-p (string-append out "/include"))
+                 (mkdir-p (string-append out "/bin"))
+                 ;; Fix rpath.
+                 (substitute* "tools/Makefile.linux"
+                   (("-rpath,\\.")
+                    (string-append "-rpath," out "/lib/"))
+                   (("/usr/local")
+                    out))
+                 ;; Set right output.
+                 (substitute* "Makefile"
+                   (("/usr/lib")
+                    (string-append out "/lib"))
+                   (("\\/usr\\/local")
+                    out))
+                 #t))))))
       (synopsis "3D triangle mesh format and related tools and libraries")
       (description "OpenCTM is a file format, a software library and a tool set
 for compression of 3D triangle meshes.  The geometry is compressed to a