fix bioconda#836

bioconda_utils/build.py

@@ -116,6 +116,16 @@ def build(recipe: str, pkg_paths: List[str] = None,
                                         env=whitelisted_env,
                                         noarch=is_noarch)
             # Use presence of expected packages to check for success
+            if (docker_builder.pkg_dir is not None):
+                    platform = os.environ.get('OSTYPE', sys.platform)
+                    if platform.startswith("darwin"):
+                        platform = 'osx'
+                    elif platform == "linux-gnu":
+                        platform = "linux"
+
+                    config = load_conda_build_config(platform=platform)
+                    pkg_paths = [p.replace(config.output_folder, docker_builder.pkg_dir) for p in pkg_paths]
+
             for pkg_path in pkg_paths:
                 if not os.path.exists(pkg_path):
                     logger.error(