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pip failied to build evdev

I used pip install evdev to install evdev in a conda env installed on Ubuntu. But it gives the following error.

 In file included from /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/Python.h:91,
 from src/evdev/ecodes.c:1:
 src/evdev/ecodes.c: In function ‘PyInit__ecodes’:
 src/evdev/ecodes.c:542:29: error: ‘KEY_LINK_PHONE’ undeclared (first use in this function); did you mean ‘KEY_PICKUP_PHONE’?
 542 | PyModule_AddIntMacro(m, KEY_LINK_PHONE);
 | ^~~~~~~~~~~~~~
 /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/modsupport.h:63:67: note: in definition of macro ‘PyModule_AddIntMacro’
 63 | #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 | ^
 src/evdev/ecodes.c:542:29: note: each undeclared identifier is reported only once for each function it appears in
 542 | PyModule_AddIntMacro(m, KEY_LINK_PHONE);
 | ^~~~~~~~~~~~~~
 /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/modsupport.h:63:67: note: in definition of macro ‘PyModule_AddIntMacro’
 63 | #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 | ^
 src/evdev/ecodes.c:616:29: error: ‘KEY_REFRESH_RATE_TOGGLE’ undeclared (first use in this function)
 616 | PyModule_AddIntMacro(m, KEY_REFRESH_RATE_TOGGLE);
 | ^~~~~~~~~~~~~~~~~~~~~~~
 /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/modsupport.h:63:67: note: in definition of macro ‘PyModule_AddIntMacro’
 63 | #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 | ^
 src/evdev/ecodes.c:631:29: error: ‘KEY_ACCESSIBILITY’ undeclared (first use in this function)
 631 | PyModule_AddIntMacro(m, KEY_ACCESSIBILITY);
 | ^~~~~~~~~~~~~~~~~
 /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/modsupport.h:63:67: note: in definition of macro ‘PyModule_AddIntMacro’
 63 | #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 | ^
 src/evdev/ecodes.c:632:29: error: ‘KEY_DO_NOT_DISTURB’ undeclared (first use in this function)
 632 | PyModule_AddIntMacro(m, KEY_DO_NOT_DISTURB);
 | ^~~~~~~~~~~~~~~~~~
 /nvme-ssd1/wuwenqiang/nvme-ssd1/wuwenqiang/envs/human_policy/include/python3.11/modsupport.h:63:67: note: in definition of macro ‘PyModule_AddIntMacro’
 63 | #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 | ^
 error: command '/usr/bin/gcc' failed with exit code 1
 [end of output]
 
 note: This error originates from a subprocess, and is likely not a problem with pip.
 ERROR: Failed building wheel for evdev
Failed to build evdev
error: failed-wheel-build-for-install×ばつ Failed to build installable wheels for some pyproject.toml based projects

I tried to add gcc to environment path but didn't work. And I checked the gcc path. It uses the system compiler. Is there anyone know how to solve it?

Answer*

Here are some fixes from the [issue 166](https://github.com/gvalkov/python-evdev/issues/166) on the evdev GitHub repository page.

### 1

```bash
brew unlink linux-headers
```

Which was mentioned by [albertz](https://github.com/albertz).

### 2

```bash
export CC=/usr/bin/gcc
export CXX=/usr/bin/g++
```

Which was mentioned by [syhanjin](https://github.com/syhanjin)

---

The issue was replicated using `Ubuntu22.04, Python3.10 (through conda)`

---

Some options that probably won't work, but I mine as well put them here:

1. Use a different ENV like [pyenv](https://github.com/pyenv/pyenv)
2. Reinstall _GCC_ / _G++_

_Most likely won't do anything, but you never know_

---

It does seem like the issue is mostly on Ubuntu, since users on other platforms seem to say it works fine.

---

__PS__ - [jabaa](https://stackoverflow.com/users/16540390/jabaa) pointed out issue #166 in their comment on this post, I just wanted to put the info here.

---

***EDIT***

I made this while really tired, so I'm sorry if I messed some stuff up here.

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pip failied to build evdev

Answer*