Install to a directory, and use that, instead of just the build/lib...

packages/numpy/meta.yaml

@@ -18,6 +18,7 @@ source:
     - patches/pass-along-errors-from-init.patch
     - patches/use-dummy-threading.patch
     - patches/use-local-blas-lapack.patch
+    - patches/fix-install-with-skip-build.patch
 
 build:
   cflags: -include math.h -I../../config

tools/buildpkg.py

@@ -135,17 +135,17 @@ def compile(path, srcpath, pkg, args):
 
 
 def package_files(buildpath, srcpath, pkg, args):
-    if (buildpath / '.pacakaged').is_file():
+    if (buildpath / '.packaged').is_file():
         return
 
     name = pkg['package']['name']
-    libdir = get_libdir(srcpath, args)
+    install_prefix = (srcpath / 'install').resolve()
     subprocess.run([
         'python',
         Path(os.environ['EMSCRIPTEN']) / 'tools' / 'file_packager.py',
         name + '.data',
         '--preload',
-        '{}@/lib/python3.6/site-packages'.format(libdir),
+        '{}@/'.format(install_prefix),
         '--js-output={}'.format(name + '.js'),
         '--export-name=pyodide',
         '--exclude', '*.wasm.pre',

tools/pywasmcross

@@ -186,12 +186,23 @@ def clean_out_native_artifacts():
                 path.unlink()
 
 
+def install_for_distribution():
+    subprocess.check_call(
+        [Path(args.host) / 'bin' / 'python3',
+         'setup.py',
+         'install',
+         '--skip-build',
+         '--prefix=install',
+         '--old-and-unmanageable'])
+
+
 def build_wrap(args):
     build_log_path = Path('build.log')
     if not build_log_path.is_file():
         capture_compile(args)
     clean_out_native_artifacts()
     replay_compile(args)
+    install_for_distribution()
 
 
 def parse_args():