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## Developer environment
New method `meson.add_devenv()` adds an [`environment()`](#environment) object
to the list of environments that will be applied when using `meson devenv`
command line. This is useful for developpers who wish to use the project without
installing it, it is often needed to set for example the path to plugins
directory, etc. Alternatively, a list or dictionary can be passed as first
argument.
``` meson
devenv = environment()
devenv.set('PLUGINS_PATH', meson.current_build_dir())
...
meson.add_devenv(devenv)
```
New command line has been added: `meson devenv -C builddir [<command>]`.
It runs a command, or open interactive shell if no command is provided, with
environment setup to run project from the build directory, without installation.
These variables are set in environment in addition to those set using `meson.add_devenv()`:
- `MESON_DEVENV` is defined to `'1'`.
- `MESON_PROJECT_NAME` is defined to the main project's name.
- `PKG_CONFIG_PATH` includes the directory where Meson generates `-uninstalled.pc`
files.
- `PATH` includes every directory where there is an executable that would be
installed into `bindir`. On windows it also includes every directory where there
is a DLL needed to run those executables.
- `LD_LIBRARY_PATH` includes every directory where there is a shared library that
would be installed into `libdir`. This allows to run system application using
custom build of some libraries. For example running system GEdit when building
GTK from git. On OSX the environment variable is `DYLD_LIBRARY_PATH` and
`PATH` on Windows.
- `GI_TYPELIB_PATH` includes every directory where a GObject Introspection
typelib is built. This is automatically set when using `gnome.generate_gir()`.
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