[bug#54507] [PATCH v3 3/3] gnu: openfst-1.7.3: Enable ngram-fst extension & C++14 build

[Aurora via Guix-patches via <guix-patches@gnu.org>]

The extension doesn't build in old versions of openfst such as 1.7.3 without
manually setting CXXFLAGS.

This package definition, including this workaround to build extensions
successfully, will need to be removed once kaldi is fixed upstream and can be
used with up-to-date versions of openfst.
---
 gnu/packages/machine-learning.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/machine-learning.scm b/gnu/packages/machine-learning.scm
index ddc1392..d4a3604 100644
--- a/gnu/packages/machine-learning.scm
+++ b/gnu/packages/machine-learning.scm
@@ -596,7 +596,9 @@ optimizing, and searching weighted finite-state transducers (FSTs).")
                                   "FstDownload/openfst-" version ".tar.gz"))
               (sha256
                (base32
-                "038a60w7y8qnbxmcrsim9rafz9mihsny8xv50jpzlr7rl166pp5q"))))))
+                "038a60w7y8qnbxmcrsim9rafz9mihsny8xv50jpzlr7rl166pp5q"))))
+    (arguments '(#:configure-flags '("--enable-ngram-fsts" "CXXFLAGS=-std=c++14")
+                 #:make-flags '("CXXFLAGS=-std=c++14")))))
 
 (define-public shogun
   (package
-- 
2.30.2