Pyenv 编译失败，有没有大佬知道怎么解决？

Pyenv 用

brew install pyenv

安装好后

然后

pyenv install 3.9.0

报错如图：

尝试 head 版本，依然报错

以前用 catalina 没这问题，升级 big sur 后一直编译失败，尝试 3.7.6

$ pyenv install 3.7.6
python-build: use [email protected] from homebrew
python-build: use readline from homebrew
Downloading Python-3.7.6.tar.xz...
-> https://www.python.org/ftp/python/3.7.6/Python-3.7.6.tar.xz
Installing Python-3.7.6...
python-build: use readline from homebrew
python-build: use zlib from xcode sdk

BUILD FAILED (OS X 11.0 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/gj/x6v5vwdx1v7741fdfcxwmr100000gn/T/python-build.20200830033458.15319
Results logged to /var/folders/gj/x6v5vwdx1v7741fdfcxwmr100000gn/T/python-build.20200830033458.15319.log

Last 10 log lines:
    struct sf_hdtr sf;
           ^
./Modules/posixmodule.c:8401:15: error: implicit declaration of function 'sendfile' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        ret = sendfile(in, out, offset, &sbytes, &sf, flags);
              ^
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include   -I/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include   -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration   -I. -I./Include -I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/koji/.pyenv/versions/3.7.6/include  -I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/koji/.pyenv/versions/3.7.6/include    -c ./Modules/pwdmodule.c -o Modules/pwdmodule.o
2 errors generated.
make: *** [Modules/posixmodule.o] Error 1
make: *** Waiting for unfinished jobs....
1 warning generated.

尝试重新安装 zlib

$ brew install zlib
$ export LDFLAGS="-L/usr/local/opt/zlib/lib" 
$ export CPPFLAGS="-I/usr/local/opt/zlib/include

依然报错。

尝试直接 brew 安装 Python 3.9，成功。说明编译工具没问题，是 pyenv 的问题，目前有大佬知道怎么解决吗？ pyenv 对我来说蛮重要的