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