Change in osu benchmark for mpi

common/benchmark.scm

@@ -34,6 +34,14 @@
               (base32
                 "19a4wg0msipibkxsi8i0c34d07512yfaj2k37dxg5541ysdw690f"))))
     (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'setenv
+           (lambda _
+             (setenv "CC" (which "mpicc"))
+             (setenv "CXX" (which "mpic++"))
+             #t)))))
     (propagated-inputs
       `(("openmpi" ,openmpi)))
   (synopsis "OSU micro benchmarks")