gst-build rust doesn't compile

OS: Ubuntu 20.04
git clone --branch 1.18.4 https://gitlab.freedesktop.org/gstreamer/gst-build.git
meson -Drs=enabled build
ninja -C build

Code doesn't compile. Maybe it's worth freezing a version for the rust just like the stable releases of gstreamer? Master branch in gst-plugins-rs.wrap is problematic.

    Updating crates.io index
    Updating git repository `https://github.com/gtk-rs/gtk-rs-core`
    Updating git repository `https://gitlab.freedesktop.org/gstreamer/gstreamer-rs`
    Updating git repository `https://github.com/fengalin/tokio`
    Updating git repository `https://github.com/gtk-rs/gtk3-rs`
    Updating git repository `https://github.com/rust-av/flavors`
   Compiling gst-plugin-version-helper v0.6.0 (/home/wk/workspace/gst-build/subprojects/gst-plugins-rs/version-helper)
   Compiling gstreamer v0.17.0 (https://gitlab.freedesktop.org/gstreamer/gstreamer-rs#b1088a6d)
   Compiling gst-plugin-lewton v0.6.0 (/home/wk/workspace/gst-build/subprojects/gst-plugins-rs/audio/lewton)
error[E0053]: method `try_from_glib` has an incompatible type for trait
   --> /home/wk/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/b1088a6/gstreamer/src/enums.rs:63:13
    |
63  |               fn try_from_glib(val: ffi::$ffi_type) -> Result<$ok_type, $err_type> {
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found normal fn
...
109 | / impl_return_result_traits!(
110 | |     GstStateChangeReturn,
111 | |     StateChangeReturn,
112 | |     StateChangeSuccess,
113 | |     StateChangeError
114 | | );
    | |__- in this macro invocation
    |
    = note: expected fn pointer `unsafe fn(_) -> Result<_, _>`
               found fn pointer `fn(_) -> Result<_, _>`
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0053]: method `try_from_glib` has an incompatible type for trait
   --> /home/wk/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/b1088a6/gstreamer/src/enums.rs:63:13
    |
63  |             fn try_from_glib(val: ffi::$ffi_type) -> Result<$ok_type, $err_type> {
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found normal fn
...
193 | impl_return_result_traits!(GstFlowReturn, FlowReturn, FlowSuccess, FlowError);
    | ------------------------------------------------------------------------------ in this macro invocation
    |
    = note: expected fn pointer `unsafe fn(_) -> Result<_, _>`
               found fn pointer `fn(_) -> Result<_, _>`
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0053]: method `try_from_glib` has an incompatible type for trait
   --> /home/wk/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/b1088a6/gstreamer/src/enums.rs:63:13
    |
63  |               fn try_from_glib(val: ffi::$ffi_type) -> Result<$ok_type, $err_type> {
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found normal fn
...
247 | / impl_return_result_traits!(
248 | |     GstPadLinkReturn,
249 | |     PadLinkReturn,
250 | |     PadLinkSuccess,
251 | |     PadLinkError
252 | | );
    | |__- in this macro invocation
    |
    = note: expected fn pointer `unsafe fn(_) -> Result<_, _>`
               found fn pointer `fn(_) -> Result<_, _>`
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0053]: method `try_from_glib` has an incompatible type for trait
   --> /home/wk/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/b1088a6/gstreamer/src/enums.rs:63:13
    |
63  |             fn try_from_glib(val: ffi::$ffi_type) -> Result<$ok_type, $err_type> {
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found normal fn
...
313 | impl_return_result_traits!(GstClockReturn, ClockReturn, ClockSuccess, ClockError);
    | ---------------------------------------------------------------------------------- in this macro invocation
    |
    = note: expected fn pointer `unsafe fn(_) -> Result<_, _>`
               found fn pointer `fn(_) -> Result<_, _>`
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 4 previous errors