New submission from Jason R. Coombs <jar...@jaraco.com>:

Attempting to build Python on macOS following [the 
instructions](https://devguide.python.org/setup/#macos-and-os-x) (for Homebrew).

xz is installed:

```
$ brew --prefix xz                                                              
                                              
/Users/jaraco/.local/homebrew/opt/xz
```

Yet, after running `./configure`, which makes no mention of "xz" or "lzma", 
"make" fails with:

```
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv 
-O3 -Wall -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter 
-Wno-missing-field-initializers -Wstrict-prototypes 
-Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal 
-I./Include -I. -I/Users/jaraco/code/public/cpython/Include 
-I/Users/jaraco/code/public/cpython -c 
/Users/jaraco/code/public/cpython/Modules/_lzmamodule.c -o 
build/temp.macosx-10.15-x86_64-3.9/Users/jaraco/code/public/cpython/Modules/_lzmamodule.o
/Users/jaraco/code/public/cpython/Modules/_lzmamodule.c:16:10: fatal error: 
'lzma.h' file not found
#include <lzma.h>
         ^~~~~~~~
1 error generated.
```

Yet the file is there: 

```
$ ls ~/.local/homebrew/opt/xz/include                                           
                                              
lzma   lzma.h
```

What's missing from the instructions that I should be doing?

----------
messages: 370582
nosy: jaraco
priority: normal
severity: normal
status: open
title: lzma.h file not found building on macOS

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40840>
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