I am observing extremely similar error messages, perhaps identical, on 
OpenSUSE Tumbleweed linux in Python 3.11.4, also attempting to install 
cysignals-1.11.2. As with the original post, the first seemingly 
substantive error message is
```
      Error compiling Cython file:
      ------------------------------------------------------------
      ...
      import sys
      from gc import collect
      
      
      cdef extern from "implementation.c":
          cysigs_t cysigs
          ^
      ------------------------------------------------------------
      
      src/cysignals/signals.pyx:39:4: 'cysigs_t' is not a type identifier
```
Hence I too would be interested in any help/guidance, thanks.
On Wednesday, August 16, 2023 at 6:57:05 AM UTC-7 JC wrote:

> Dear Sage developers,
>
> I'm trying to install the cysignals 1.11.2 package in Python 3.9.7 using 
> pip (on a computer with macOS system and Apple M2 chip) and have already 
> installed the prerequisite packages Cython and Sphinx, but still failed 
> with some Cython compiling errors (please see the error message attached). 
> Do you know what the problem might be and how I can fix it?
>
> Thank you very much!
>

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