Building python-based Mac app with py2app, creating an installer, generates failing installer

I hope someone on this list can help… I haven’t been able to find many answers on the web.

Environment: Mac OS 10.8 & 10.11, Python 2.7.6, py2app 0.14

I create a Mac application bundle from python, using `py2app`, on Mac OS 10.8. This seems to work fine. I then build an installer package using `pkgbuild` and `productbuild`. That appears to build with no errors, until I try to use the installer to install the package.

I'm running the installer on MacOS 10.11 (it will also have to run on MacOS 10.8-10.13). The installation fails, with the following in the install.log:

Dec 21 15:14:46 Erics-10-11-Mac-VM shove[30757]: [src=nonrestricted] /System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/pyconfig.h: unable to remove flag 0x80000 (error 1)
Dec 21 15:14:46 Erics-10-11-Mac-VM shove[30757]: [source=file] failed _RelinkFile(/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/3BE46873-2E16-4787-81A4-335FB1DCB67B.activeSandbox/Root/Applications/MyApp.app/Contents/Resources/include/python2.7/pyconfig.h, /System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/pyconfig.h): Operation not permitted
Dec 21 15:14:46 Erics-10-11-Mac-VM shove[30757]: srcPath = /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/PKInstallSandboxManager/3BE46873-2E16-4787-81A4-335FB1DCB67B.activeSandbox/Root/Applications/MyApp.app/Contents/Resources/include/python2.7/pyconfig.h NSFileOwnerAccountID=0 NSFileHFSTypeCode=0 NSFileSystemFileNumber=1025119 NSFileExtensionHidden=0 NSFileSystemNumber=16777219 NSFileSize=36515 NSFileGroupOwnerAccountID=0 NSFileOwnerAccountName=root NSFileCreationDate=2017-12-21 20:12:33 +0000 NSFilePosixPermissions=420 NSFileHFSCreatorCode=0 NSFileType=NSFileTypeRegular NSFileGroupOwnerAccountName=wheel NSFileReferenceCount=1 NSFileModificationDate=2017-12-21 20:12:33 +0000

The issue seems to be that the installer wants to copy (or do something with) `Contents/Resources/include/pyconfig.h` into `/System/Library/Frameworks/Python.framework...` but that operation is not permitted. It's presumably not permitted due to the MacOS System Integrity Protection on `/System/`.

This raises a couple of questions:

 1. What exactly is the installer trying to do by copying `pyconfig.h` into a System directory (which is expressly prohibited?) Besides, there's already a `pyconfig.h` there.
 3. What can I do to fix this? Somehow tell `py2app` not to put `pyconfig.h` in the `include` folder? Tell the installer to not copy it into the `System` folder? Is there a workaround? Disabling `SIP` is not an option.

Note that I'm constrained to build on MacOS 10.8, and install on arbitrary systems from MacOS 10.8 - 10.3.

Thanks for your help!

-EricF

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