meson/docs/markdown/snippets/customimplicit.md

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## Do not add custom target dir to header path if `implicit_include_directories` is `false`
If you do the following:
```meson
# in some subdirectory
gen_h = custom_target(...)
# in some other directory
executable('foo', 'foo.c', gen_h)
```
then the output directory of the custom target is automatically added
to the header search path. This is convenient, but sometimes it can
lead to problems. Starting with this version, the directory will no
longer be put in the search path if the target has
`implicit_include_directories: false`. In these cases you need to set
up the path manually with `include_directories`.