README: Upgrade build instructions

README.md

@@ -24,32 +24,6 @@ neat. Note: This is a beta release, so the interface is not yet stable.
 
 To build just run:
 ```
-make 
+meson build
+ninja -C build
 ```
-
-### Installing
-```
-make install
-```
-
-### Variables
- * `CFLAGS`: Flags passed to the compiler.
- * `LDFLAGS`: Flags passed to the linker.
- * `BUILD_DIR`: Destination directory for the build.
- * `PREFIX`: System prefix. Default: `/usr/local`.
- * `DESTDIR`: Destination directory for install. This is used by system
-   package system such as dpkg, rpm and pacman.
- * `PKGCONFIG`: `pkg-config` executable path.
- * `STRIP`: `strip` executable path.
- * `DONT_STRIP`: Set this is the installed DSO is not to be stripped of its
-   debugging symbols.
-
-### Cross-compiling
-Generally, it should be enough to set `CC=<architecture-triplet>-gcc` and then
-run `make`, e.g.:
-```
-CC=arm-linux-gnueabihf-gcc make
-```
-If you have a `pkg-config` wrapper at `<triplet>-pkg-config` it will be run
-instead if `pkg-config`, but `pkg-config` can also be overridden by setting the
-`PKGCONFIG` environment variable prior to running `make`.