Is it possible to use a makefile that directs the make process itself to `chdir`? I want to write a makefile that expects to be executed from the build directory.

Suppose I have a project directory structure that looks like this

```
project/
├── Makefile
├── include
│   └── Foo.h
├── src
│   └── Foo.cpp
└── test
    └── FooTest.cpp

```

and the first thing the make directory does is make a build directory.

```
project/
├── Makefile
├── _build
├── include
│   └── Foo.h
├── src
│   └── Foo.cpp
└── test
    └── FooTest.cpp

```

Is it possible to direct the makefile to `chdir` into `_build` to simplify my rules?

I want to be able to write (for example)

```
foo : Foo.o
    $(LD) $^ -o $@ $(LDFLAGS)

```

rather than

```
_build/foo : _build/Foo.o
    $(LD) $^ -o $@ $(LDFLAGS)

```

I know I can add the build directory to the `VPATH` in order to affect path resolution, but it seems cleaner to just chdir Make itself. Is there a way to do this (preferably without using guile)?