From d0da63c576e3e3149d88120edc260c9be79dabdf Mon Sep 17 00:00:00 2001
From: Julien Lepiller <julien@lepiller.eu>
Date: Sat, 30 Apr 2022 16:54:43 +0200
Subject: gnu: ocaml-num: Fix race condition.

* gnu/packages/ocaml.scm (ocaml-num)[arguments]: Fix race condition.
---
 gnu/packages/ocaml.scm | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gnu/packages/ocaml.scm b/gnu/packages/ocaml.scm
index fa98f6525d..85bf4d064b 100644
--- a/gnu/packages/ocaml.scm
+++ b/gnu/packages/ocaml.scm
@@ -1045,6 +1045,19 @@ written in Objective Caml.")
        (sha256
         (base32 "1vzdnvpj5dbj3ifx03v25pj2jj1ccav072v4d29pk1czdba2lzfc"))))
     (build-system dune-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'fix-race
+           (lambda _
+             ;; There's a race between bng.o and bng_generic.c.  Both depend on
+             ;; the architecture specific bng.c, but only the latter declares
+             ;; the dependency.
+             (mkdir-p "_build/default/src")
+             (for-each
+               (lambda (f)
+                 (copy-file f (string-append "_build/default/" f)))
+               (find-files "src" "bng_.*\\.c")))))))
     (home-page "https://github.com/ocaml/num")
     (synopsis "Arbitrary-precision integer and rational arithmetic")
     (description "OCaml-Num contains the legacy Num library for
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