MAINT: clearer error message in setup.py

pv · pv · commit 2ad65f71a31b · 2020-06-30T19:15:07.000+03:00
Say "libraries", not "resources", and add information where to find out
more.
diff --git a/setup.py b/setup.py
@@ -470,10 +470,17 @@ def configuration(parent_package='', top_path=None):
     lapack_opt = get_info('lapack_opt')
 
     if not lapack_opt:
-        msg = 'No lapack/blas resources found.'
         if sys.platform == "darwin":
-            msg = ('No lapack/blas resources found. '
+            msg = ('No BLAS/LAPACK libraries found. '
                    'Note: Accelerate is no longer supported.')
+        else:
+            msg = 'No BLAS/LAPACK libraries found.'
+        msg += ("\n"
+                "To build Scipy from sources, BLAS & LAPACK libraries "
+                "need to be installed.\n"
+                "See site.cfg.example in the Scipy source directory and\n"
+                "https://docs.scipy.org/doc/scipy/reference/building/index.html "
+                "for details.")
         raise NotFoundError(msg)
 
     config = Configuration(None, parent_package, top_path)
