Also fix the README.
@@ -56,7 +56,7 @@ are included as git submodules. To build urbit from source, perform the followin
To configure project, enter the build directory and enter
`meson configure`. Without any arguments this command will display available
options. For example, to compile debug build of urbit, use
-`meson configure -Ddebug=true`.
+`meson configure -Dbuildtype=debug`.
To set the prefix for installation use
`meson configure -Dprefix=/usr`, and so on.
