noarch: generic for empty external package

Author: minrk

recipe/conda_build_config.yaml

@@ -1,5 +1,5 @@
 mpi_type:
-  - external
+  - external  # [linux and x86_64]
   - conda
 docker_image:  # [linux and x86_64]
   - quay.io/condaforge/linux-anvil-cos7-cuda:10.2     # [linux and x86_64]

recipe/meta.yaml

@@ -1,6 +1,6 @@
 {% set version = "4.1.3" %}
 {% set major = version.rpartition('.')[0] %}
-{% set build = 3 %}
+{% set build = 4 %}
 
 # give conda package a higher build number
 {% if mpi_type == 'conda' %}
@@ -24,6 +24,8 @@ build:
 outputs:
   {% if mpi_type == 'external' %}
   - name: openmpi
+    build:
+      noarch: generic
     string: {{ mpi_type }}_{{ build }}
     track_features:
       - openmpi_{{ mpi_type }}