Note that install is broken on Alpine Linux (#541)

Related:

Resolves #541

PiperOrigin-RevId: 304020432

README.md

@@ -93,11 +93,18 @@ interpreter in `$PATH` for the Python version of the code you're analyzing.
 
 Platform support:
 
-* Pytype is currently developed and tested on Linux, which is the main supported
+* Pytype is currently developed and tested on Linux\*, which is the main supported
   platform.
 * Installation on MacOSX requires OSX 10.7 or higher and Xcode v8 or higher.
 * Windows is currently not supported unless you use [WSL][wsl].
 
+<sub>\*
+Note: On Alpine Linux, installing may fail due to issues with upstream
+dependencies.  See the details of
+<a href="https://github.com/scikit-build/ninja-python-distributions/issues/27">
+this issue</a> for a possible fix.
+</sub>
+
 ## Installing
 
 Pytype can be installed via pip. Note that the installation requires `wheel`

docs/index.md

@@ -91,11 +91,18 @@ interpreter in `$PATH` for the Python version of the code you're analyzing.
 
 Platform support:
 
-* Pytype is currently developed and tested on Linux, which is the main supported
+* Pytype is currently developed and tested on Linux\*, which is the main supported
   platform.
 * Installation on MacOSX requires OSX 10.7 or higher and Xcode v8 or higher.
 * Windows is currently not supported unless you use [WSL][wsl].
 
+<sub>\*
+Note: On Alpine Linux, installing may fail due to issues with upstream
+dependencies.  See the details of
+<a href="https://github.com/scikit-build/ninja-python-distributions/issues/27">
+this issue</a> for a possible fix.
+</sub>
+
 ## Installing
 
 Pytype can be installed via pip. Note that the installation requires `wheel`