Cannot build Firefox 57 from pkgsrc2017q4

[Wes Frazier <wes.frazier%members.fsf.org@localhost>]

Ive upgraded from pkgsrc2017q3 to pkgsrc2017q4 on NetBSD 7.1 (Haven't 
upgraded to 7.1.1 yet).

I can't get Firefox 57.0.2 to build. It fails with 'error: Could not 
compile `style`. While its building servo components.

All other packages have built fine. clang-5.0.0 and rust-1.23.0 are 
installed and built from the same pkgsrc snapshot.

Output from the build failure follows. Any insight or suggestions would 
be appreciated.

----------------------------------------------

   Compiling style_traits v0.0.1 
(file:///usr/pkgsrc/www/firefox/work/firefox-57
.0.2/servo/components/style_traits)
warning: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style_traits$
viewport.rs:10:5
   |
10 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^
   |
   = note: #[warn(unused_imports)] on by default

   Compiling quasi v0.32.0
   Compiling syntex v0.58.1
   Compiling aster v0.41.0
   Compiling quasi_codegen v0.32.0
   Compiling bindgen v0.29.1
   Compiling style v0.0.1 
(file:///usr/pkgsrc/www/firefox/work/firefox-57.0.2/s$
rvo/components/style)
error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/gecko_$
tring_cache/mod.rs:16:5
   |
16 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/lib.rs:
26:9
   |
26 | #![deny(warnings)]
   |         ^^^^^^^^
   = note: #[deny(unused_imports)] implied by #[deny(warnings)]

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/counter
_style/mod.rs:18:5
   |
18 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/custom_
properties.rs:17:5
   |
17 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/str.rs$
10:5
   |
10 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/styles$
eets/viewport_rule.rs:23:5
   |
23 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
mod.rs:15:5
   |
15 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/mod.rs:14:5
   |
14 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/align.rs:13:5
   |
13 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
 --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/s
pecified/angle.rs:9:5
  |
9 | use std::ascii::AsciiExt;
  |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/calc.rs:11:5
   |
11 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/grid.rs:10:5
   |
10 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/length.rs:15:5
   |
15 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
 --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/s
pecified/percentage.rs:9:5
  |
9 | use std::ascii::AsciiExt;
  |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
  --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/
specified/text.rs:10:5
   |
10 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
 --> 
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/servo/components/style/values/s
pecified/time.rs:9:5
  |
9 | use std::ascii::AsciiExt;
  |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
    --> 
/usr/pkgsrc/www/firefox/work/build/toolkit/library/x86_64-unknown-netbsd
/release/build/style-8a83784a1791e0e1/out/gecko/pseudo_element_definition.rs:127
0:13
     |
1270 |         use std::ascii::AsciiExt;
     |             ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
    --> 
/usr/pkgsrc/www/firefox/work/build/toolkit/library/x86_64-unknown-netbsd
/release/build/style-8a83784a1791e0e1/out/gecko/pseudo_element_definition.rs:164
0:13
     |
1640 |         use std::ascii::AsciiExt;
     |             ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
     --> 
/usr/pkgsrc/www/firefox/work/build/toolkit/library/x86_64-unknown-netbs
d/release/build/style-8a83784a1791e0e1/out/properties.rs:25511:17
      |
25511 |             use std::ascii::AsciiExt;
      |                 ^^^^^^^^^^^^^^^^^^^^

error: unused import: `std::ascii::AsciiExt`
     --> 
/usr/pkgsrc/www/firefox/work/build/toolkit/library/x86_64-unknown-netbs
d/release/build/style-8a83784a1791e0e1/out/properties.rs:36640:17
      |
36640 |             use std::ascii::AsciiExt;
      |                 ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 19 previous errors

error: Could not compile `style`.

To learn more, run the command again with --verbose.
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/config/rules.mk:1001: recipe 
for tar
get 'force-cargo-library-build' failed
gmake[3]: *** [force-cargo-library-build] Error 101
gmake[3]: Leaving directory 
'/usr/pkgsrc/www/firefox/work/build/toolkit/library/
rust'
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/config/recurse.mk:73: recipe 
for tar
get 'toolkit/library/rust/target' failed
gmake[2]: *** [toolkit/library/rust/target] Error 2
gmake[2]: Leaving directory '/usr/pkgsrc/www/firefox/work/build'
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/config/recurse.mk:32: recipe 
for tar
get 'compile' failed
gmake[1]: *** [compile] Error 2
gmake[1]: Leaving directory '/usr/pkgsrc/www/firefox/work/build'
/usr/pkgsrc/www/firefox/work/firefox-57.0.2/config/rules.mk:452: recipe 
for targ
et 'all' failed
gmake: *** [all] Error 2
*** Error code 2

Stop.
make[1]: stopped in /usr/pkgsrc/www/firefox