gnu: Add faust-0.9.67.

* gnu/packages/audio.scm (faust-0.9.67): New variable.

gnu/packages/audio.scm

@@ -1914,6 +1914,40 @@ also play midifiles using a Soundfont.")
      "Faust is a programming language for realtime audio signal processing.")
     (license license:gpl2+)))
 
+;; This version is needed to build older synths that require the lv2synth.cpp
+;; architecture file, such as sorcer.
+(define-public faust-0.9.67
+  (package
+    (inherit faust)
+    (name "faust")
+    (version "0.9.67")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/grame-cncm/faust")
+                    (commit (string-append "v"
+                                           (string-map (lambda (c)
+                                                         (if (char=? c #\.) #\- c))
+                                                       version)))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0856x666s6ymzk8v15f9gy402dbr8c9v2s40hyfadhraqljmqrm0"))
+              (snippet
+               ;; Remove prebuilt library
+               '(delete-file "architecture/android/libs/armeabi-v7a/libfaust_dsp.so"))))
+    (build-system gnu-build-system)
+    (arguments
+     (list
+      #:make-flags
+      #~(list (string-append "prefix=" #$output))
+      #:tests? #f
+      #:phases
+      '(modify-phases %standard-phases
+         ;; no "configure" script
+         (delete 'configure))))
+    (native-inputs (list unzip))))
+
 (define-public faust-2
   (package
     (inherit faust)