Build failed E0433

[akil]

Distribution (run cat /etc/os-release):
NAME=Slackware
VERSION="14.2"
ID=slackware
VERSION_ID=14.2
PRETTY_NAME="Slackware 14.2 x86_64 (post 14.2 -current)"
ANSI_COLOR="0;34"
CPE_NAME="cpe:/o:slackware:slackware_linux:14.2"
HOME_URL="http://slackware.com/"
SUPPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
BUG_REPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
VERSION_CODENAME=current

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

$ rustc -V
rustc 1.52.1 (9bc8c42bb 2021-05-09)
                                                                                                                                                                                                                                               
$ cargo -V
cargo 1.52.0 (69767412a 2021-04-21)

Issue/Bug Description:

$ make all
[...]
   Compiling synstructure v0.12.4
   Compiling proc-macro-error v0.2.6
   Compiling tokio-threadpool v0.1.18
   Compiling cookie v0.12.0
   Compiling publicsuffix v1.5.6
   Compiling tokio-reactor v0.1.12
   Compiling h2 v0.1.26
   Compiling http-body v0.1.0
   Compiling tokio-tcp v0.1.4
error[E0433]: failed to resolve: could not find `__rt` in `quote`
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/err-derive-0.1.6/src/lib.rs:145:63
    |
145 | fn display_body(s: &synstructure::Structure) -> Option<quote::__rt::TokenStream> {
    |                                                               ^^^^ could not find `__rt` in `quote`

   Compiling tokio v0.1.22
error: aborting due to previous error

For more information about this error, try `rustc --explain E0433`.
error: could not compile `err-derive`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
   Compiling either v1.6.1
   Compiling enum_derive v0.1.7
   Compiling libdbus-sys v0.2.1
   Compiling bitflags v1.2.1
   Compiling serde v1.0.126
   Compiling err-derive v0.1.6
   Compiling failure v0.1.8
   Compiling hyper v0.12.36
error[E0433]: failed to resolve: could not find `__rt` in `quote`
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/err-derive-0.1.6/src/lib.rs:145:63
    |
145 | fn display_body(s: &synstructure::Structure) -> Option<quote::__rt::TokenStream> {
    |                                                               ^^^^ could not find `__rt` in `quote`

   Compiling itertools v0.8.2
error: aborting due to previous error

For more information about this error, try `rustc --explain E0433`.
error: could not compile `err-derive`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
make: *** [Makefile:48: target/release/system76-firmware-cli] Error 101

Steps to reproduce (if you know):
Type make all

Expected behavior:
build successful

Other Notes: