Clarify instruction for building with vcpkg
Mention VCPKGRS_DYNAMIC environment variable.
@@ -128,7 +128,11 @@ You can adjust this behavior in a number of ways:
* Installing the sqlite3 development packages will usually be all that is required, but
the build helpers for [pkg-config](https://github.com/alexcrichton/pkg-config-rs)
and [vcpkg](https://github.com/mcgoo/vcpkg-rs) have some additional configuration
- options. The default when using vcpkg is to dynamically link. `vcpkg install sqlite3:x64-windows` will install the required library.
+ options. The default when using vcpkg is to dynamically link,
+ which must be enabled by setting `VCPKGRS_DYNAMIC=1` environment variable before build.
+ `vcpkg install sqlite3:x64-windows` will install the required library.
+
+*Note:* to change the way `libsqlite3-sys` is built, you need to run `cargo clean libsqlite3-sys` first.
### Binding generation
