diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index 31ff80e4cc..915368b8e8 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -2411,6 +2411,11 @@ parallel computing platforms.  It also supports serial execution.")
                    "CC=mpicc"
                    "F77=mpif77"
                    "--enable-mpi"
+                   (string-append
+                           "CFLAGS="
+                           " -Wno-error=builtin-declaration-mismatch"
+                           " -Wno-error=implicit-function-declaration"
+                           " -Wno-error=implicit-int")
                    (string-append
                     "ARCHDIR="
                     (assoc-ref %build-inputs "trilinos")))))))
@@ -2418,6 +2423,7 @@ parallel computing platforms.  It also supports serial execution.")
      `(("mpi" ,openmpi)))
     (inputs
      `(("trilinos" ,trilinos-parallel-xyce)
+       ("zlib" ,zlib)
        ,@(alist-delete "trilinos"
                        (package-inputs xyce-serial))))))