[issue43241] curses.h: present but cannot be compiled while building with custom CPPFLAGS

[Xuehai Pan]

New submission from Xuehai Pan <XuehaiPan at pku.edu.cn>:

I install python3 with Linuxbrew. All header files have been symlinked to "~/.linuxbrew/inlcude". It raises warnings when I building with custom CPPFLAGS.

```
checking curses.h usability... no
checking curses.h presence... yes
configure: WARNING: curses.h: present but cannot be compiled
configure: WARNING: curses.h:     check for missing prerequisite headers?
configure: WARNING: curses.h: see the Autoconf documentation
configure: WARNING: curses.h:     section "Present But Cannot Be Compiled"
configure: WARNING: curses.h: proceeding with the compiler's result
configure: WARNING:     ## --------------------------------------- ##
configure: WARNING:     ## Report this to https://bugs.python.org/ ##
configure: WARNING:     ## --------------------------------------- ##
checking for curses.h... no
checking ncurses.h usability... no
checking ncurses.h presence... yes
configure: WARNING: ncurses.h: present but cannot be compiled
configure: WARNING: ncurses.h:     check for missing prerequisite headers?
configure: WARNING: ncurses.h: see the Autoconf documentation
configure: WARNING: ncurses.h:     section "Present But Cannot Be Compiled"
configure: WARNING: ncurses.h: proceeding with the compiler's result
configure: WARNING:     ## --------------------------------------- ##
configure: WARNING:     ## Report this to https://bugs.python.org/ ##
configure: WARNING:     ## --------------------------------------- ##
checking for ncurses.h... no
checking for term.h... yes
```

See https://github.com/Homebrew/linuxbrew-core/pull/22307 for more details.

----------
components: Build
files: Screenshot config master.png
messages: 387150
nosy: XuehaiPan
priority: normal
severity: normal
status: open
title: curses.h: present but cannot be compiled while building with custom CPPFLAGS
type: compile error
versions: Python 3.9
Added file: https://bugs.python.org/file49814/Screenshot config master.png

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<https://bugs.python.org/issue43241>
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