bug#31170: Package: nix build failed

[Glenn Morris <rgm@gnu.org>]

[The "Package:" at the start of the body confused debbugs.
Report reassinged to "guix" from non-existent packages "nix", "build",
"failed".]

> Package: nix build failed
>
> starting phase `build'
>   GEN    Makefile.config
>   CXX    src/nix-hash/nix-hash.o
>   CXX    src/libmain/shared.o
>   CXX    src/libmain/stack.o
>   CXX    src/libstore/build.o
>   CXX    src/libstore/builtins.o
>   CXX    src/libstore/derivations.o
>   CXX    src/libstore/download.o
>   CXX    src/libstore/gc.o
> src/libmain/stack.cc: In function 'void nix::sigsegvHandler(int,
> siginfo_t*, void*)':
> src/libmain/stack.cc:23:21: error: 'ucontext' was not declared in this scope
>      sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
>                      ^
> src/libmain/stack.cc:23:31: error: expected primary-expression before ')' token
>      sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
>                                ^
> src/libmain/stack.cc:23:33: error: expected ')' before 'ctx'
>      sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
>                                  ^
> At global scope:
> cc1plus: warning: unrecognized command line option
> -Wno-unneeded-internal-declaration'
> make: *** [mk/patterns.mk:3: src/libmain/stack.o] Error 1
> make: *** Waiting for unfinished jobs....
> phase `build' failed after 11.2 seconds
> builder for
> /gnu/store/wqzgh59kpkgix8w673h6r07r8n5i2mnk-nix-1.11.9.drv' failed
> with exit code 1
> guix package: error: build failed: build of
> /gnu/store/wqzgh59kpkgix8w673h6r07r8n5i2mnk-nix-1.11.9.drv' failed