If you build that package yourself with makepkg what errors, if any, do you get?
You could also submit your problem on the AUR page of the package .
]]> CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
CHK include/generated/bounds.h
CHK include/generated/timeconst.h
CHK include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
DESCEND objtool
CC /home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/objtool/pager.o
pager.c: In function ‘pager_preexec’:
pager.c:35:12: error: passing argument 2 to restrict-qualified parameter aliases with argument 4 [-Werror=restrict]
select(1, &in, NULL, &in, NULL);
^~~ ~~~
cc1: all warnings being treated as errors
mv: cannot stat '/home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/objtool/.pager.o.tmp': No such file or directory
make[4]: *** [/home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/build/Makefile.build:102: /home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/objtool/pager.o] Error 1
make[3]: *** [Makefile:45: /home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/objtool/libsubcmd-in.o] Error 2
make[2]: *** [Makefile:59: /home/paddy/.cache/pacaur/linux-rt-lts/src/linux-4.9/tools/objtool/libsubcmd.a] Error 2
make[1]: *** [Makefile:60: objtool] Error 2
make: *** [Makefile:1623: tools/objtool] Error 2
==> ERROR: A failure occurred in build().
Aborting...
:: failed to build linux-rt-lts package(s)