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Add note about required feature test macros #78

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Jul 31, 2024
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Add note about required feature test macros #78

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6 changes: 5 additions & 1 deletion README.md
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Expand Up @@ -80,7 +80,9 @@ As mentioned above, there are two options:
1. Copy (or `git submodule`) `termbox2.h` into your C project. As normal,
include the header file wherever you want to use `tb_*` functions, but also
be sure to `#define TB_IMPL` in exactly one of your source files. (This is a
common pattern for single file header libraries.)
common pattern for single file header libraries.) Ensure that feature test
macros `_DEFAULT_SOURCE` and `_XOPEN_SOURCE` are defined (either by defining
them via compiler flags or including `termbox2.h` first[^1]).
2. Build termbox2 as a library (either `make libtermbox2.so` or
`make libtermbox2.a`) and link as normal. Make sure the compile-time options
remain the same for libtermbox2 and your application. (Alternatively, build
Expand Down Expand Up @@ -121,3 +123,5 @@ Other wrapper libraries:
* [matrix-tui](https://github.com/git-bruh/matrix-tui) - Matrix client
* [Vgmi](https://github.com/RealMelkor/Vgmi) - Gemini client
* [poe](https://sr.ht/~strahinja/poe/) - `.po` file editor

[^1]: See https://github.com/termbox/termbox2/pull/75#issuecomment-2252242269
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