* Package:    sys-apps/sandbox-2.16
 * Repository: gentoo
 * Maintainer: sandbox@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking sandbox-2.16.tar.xz to /var/tmp/portage/sys-apps/sandbox-2.16/work
>>> Source unpacked in /var/tmp/portage/sys-apps/sandbox-2.16/work
Unable to unshare: EACCES
>>> Preparing source in /var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16 ...
>>> Source prepared.
Unable to unshare: EACCES
>>> Configuring source in /var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16 ...
 * abi_x86_64.amd64: running multilib-minimal_abi_src_configure
 * econf: updating sandbox-2.16/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating sandbox-2.16/config.sub with /usr/share/gnuconfig/config.sub
/var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16/configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --docdir=/usr/share/doc/sandbox-2.16 --htmldir=/usr/share/doc/sandbox-2.16/html --libdir=/usr/lib64
checking for a BSD-compatible install... /usr/lib/portage/python3.7/ebuild-helpers/xattr/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking environment state... ok
checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... yes
checking for x86_64-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking whether x86_64-pc-linux-gnu-gcc understands -c and -o together... yes
checking whether make supports the include directive... yes (GNU style)
checking dependency style of x86_64-pc-linux-gnu-gcc... none
checking for library containing strerror... none required
checking how to run the C preprocessor... x86_64-pc-linux-gnu-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for x86_64-pc-linux-gnu-ar... gcc-ar
checking the archiver (gcc-ar) interface... ar
checking whether make sets $(MAKE)... (cached) yes
checking for gawk... (cached) gawk
checking for egrep... (cached) /bin/grep -E
checking for readelf... readelf
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking how to print strings... printf
checking for a sed that does not truncate output... /bin/sed
checking for fgrep... /bin/grep -F
checking for ld used by x86_64-pc-linux-gnu-gcc... /usr/x86_64-pc-linux-gnu/bin/ld
checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... gcc-nm
checking the name lister (gcc-nm) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking how to convert x86_64-pc-linux-gnu file names to x86_64-pc-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-pc-linux-gnu file names to toolchain format... func_convert_file_noop
checking for /usr/x86_64-pc-linux-gnu/bin/ld option to reload object files... -r
checking for x86_64-pc-linux-gnu-objdump... x86_64-pc-linux-gnu-objdump
checking how to recognize dependent libraries... pass_all
checking for x86_64-pc-linux-gnu-dlltool... no
checking for dlltool... no
checking how to associate runtime and link libraries... printf %s\n
checking for x86_64-pc-linux-gnu-ar... (cached) gcc-ar
checking for archiver @FILE support... @
checking for x86_64-pc-linux-gnu-strip... x86_64-pc-linux-gnu-strip
checking for x86_64-pc-linux-gnu-ranlib... gcc-ranlib
checking command to parse gcc-nm output from x86_64-pc-linux-gnu-gcc object... ok
checking for sysroot... no
checking for a working dd... /bin/dd
checking how to truncate binary pipes... /bin/dd bs=4096 count=1
checking for x86_64-pc-linux-gnu-mt... no
checking for mt... no
checking if : is a manifest tool... no
checking for dlfcn.h... yes
checking for objdir... .libs
checking if x86_64-pc-linux-gnu-gcc supports -fno-rtti -fno-exceptions... no
checking for x86_64-pc-linux-gnu-gcc option to produce PIC... -fPIC -DPIC
checking if x86_64-pc-linux-gnu-gcc PIC flag -fPIC -DPIC works... yes
checking if x86_64-pc-linux-gnu-gcc static flag -static works... yes
checking if x86_64-pc-linux-gnu-gcc supports -c -o file.o... yes
checking if x86_64-pc-linux-gnu-gcc supports -c -o file.o... (cached) yes
checking whether the x86_64-pc-linux-gnu-gcc linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking for multiple personalities... auto
checking checking for x86_64/-m64 compiler support... yes
checking checking for x86/-m32 compiler support... no
checking checking for x32/-mx32 compiler support... no
checking for size_t... yes
checking for working alloca.h... yes
checking for alloca... yes
checking for dirent.h that defines DIR... yes
checking for library containing opendir... none required
checking for ANSI C header files... (cached) yes
checking for sys/wait.h that is POSIX.1 compatible... yes
checking for dirent.h... yes
checking for dlfcn.h... (cached) yes
checking for elf.h... yes
checking for errno.h... yes
checking for execinfo.h... yes
checking for fcntl.h... yes
checking for getopt.h... yes
checking for grp.h... yes
checking for inttypes.h... (cached) yes
checking for libgen.h... yes
checking for limits.h... yes
checking for memory.h... (cached) yes
checking for pthread.h... yes
checking for pwd.h... yes
checking for sched.h... yes
checking for siginfo.h... no
checking for signal.h... yes
checking for sigsegv.h... (cached) no
checking for stdarg.h... yes
checking for stdbool.h... yes
checking for stddef.h... yes
checking for stdint.h... (cached) yes
checking for stdio.h... yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking for strings.h... (cached) yes
checking for syscall.h... yes
checking for unistd.h... (cached) yes
checking for utime.h... yes
checking for sys/file.h... yes
checking for sys/ioctl.h... yes
checking for sys/mman.h... yes
checking for sys/mount.h... yes
checking for sys/param.h... yes
checking for sys/ptrace.h... yes
checking for sys/reg.h... yes
checking for sys/socket.h... yes
checking for sys/stat.h... (cached) yes
checking for sys/syscall.h... yes
checking for sys/time.h... yes
checking for sys/types.h... (cached) yes
checking for sys/uio.h... yes
checking for sys/user.h... yes
checking for sys/wait.h... (cached) yes
checking for asm/ptrace.h... yes
checking for linux/ptrace.h... yes
checking for an ANSI C-conforming const... yes
checking for uid_t in sys/types.h... yes
checking for mode_t... yes
checking for size_t... (cached) yes
checking whether environ is declared... yes
checking for ptrdiff_t... yes
checking for sighandler_t... yes
checking for sig_t... yes
checking for __sighandler_t... yes
checking for struct user_regs_struct... yes
checking for struct pt_regs... yes
checking size of struct user_regs_struct... 216
checking size of struct pt_regs... 168
checking for unistd.h... (cached) yes
checking for working chown... yes
checking for pid_t... yes
checking vfork.h usability... no
checking vfork.h presence... no
checking for vfork.h... no
checking for fork... yes
checking for vfork... yes
checking for working fork... yes
checking for working vfork... (cached) yes
checking whether lstat correctly handles trailing slash... yes
checking whether lstat accepts an empty string... no
checking whether lstat correctly handles trailing slash... (cached) yes
checking return type of signal handlers... void
checking whether stat accepts an empty string... no
checking for backtrace... yes
checking for clone... yes
checking for __clone2... no
checking for creat64... yes
checking for faccessat... yes
checking for fchmodat... yes
checking for fchownat... yes
checking for fopen64... yes
checking for ftruncate... yes
checking for futimesat... yes
checking for getcwd... yes
checking for lchown... yes
checking for linkat... yes
checking for lutimes... yes
checking for memmove... yes
checking for memcpy... yes
checking for memset... yes
checking for mkdir... yes
checking for mkdirat... yes
checking for mkdtemp... yes
checking for mkfifoat... yes
checking for mknodat... yes
checking for mkostemp... yes
checking for mkostemp64... yes
checking for mkostemps... yes
checking for mkostemps64... yes
checking for mkstemp... yes
checking for mkstemp64... yes
checking for mkstemps... yes
checking for mkstemps64... yes
checking for open64... yes
checking for openat... yes
checking for openat64... yes
checking for pathconf... yes
checking for process_vm_readv... yes
checking for ptrace... yes
checking for realpath... yes
checking for remove... yes
checking for renameat... yes
checking for rmdir... yes
checking for setenv... yes
checking for strcasecmp... yes
checking for strchr... yes
checking for strdup... yes
checking for strerror... yes
checking for strndup... yes
checking for strrchr... yes
checking for strspn... yes
checking for strstr... yes
checking for strtok_r... yes
checking for symlinkat... yes
checking for truncate64... yes
checking for unlinkat... yes
checking for unshare... yes
checking for utime... yes
checking for utimensat... yes
checking for utimes... yes
checking for stackoverflow_install_handler in -lsigsegv... (cached) false
checking for __sync_lock_test_and_set... yes
checking for va_copy... va_copy
checking for library containing dlopen... -ldl
checking for dlvsym... yes
checking truncate argument type... off_t
checking for RTLD_NEXT... yes
checking libc path... configure: error: Unable to determine LIBC PATH (/lib64/libc.so.6")

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16-abi_x86_64.amd64/config.log
 * ERROR: sys-apps/sandbox-2.16::gentoo failed (configure phase):
 *   econf failed
 * 
 * Call stack:
 *               ebuild.sh, line  124:  Called src_configure
 *             environment, line 2843:  Called multilib-minimal_src_configure
 *             environment, line 1973:  Called multilib_foreach_abi 'multilib-minimal_abi_src_configure'
 *             environment, line 2188:  Called multibuild_foreach_variant '_multilib_multibuild_wrapper' 'multilib-minimal_abi_src_configure'
 *             environment, line 1903:  Called _multibuild_run '_multilib_multibuild_wrapper' 'multilib-minimal_abi_src_configure'
 *             environment, line 1901:  Called _multilib_multibuild_wrapper 'multilib-minimal_abi_src_configure'
 *             environment, line  376:  Called multilib-minimal_abi_src_configure
 *             environment, line 1967:  Called multilib_src_configure
 *             environment, line 2401:  Called econf
 *        phase-helpers.sh, line  718:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  119:  Called die
 * The specific snippet of code:
 *   		die "$@"
 * 
 * If you need support, post the output of `emerge --info '=sys-apps/sandbox-2.16::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-apps/sandbox-2.16::gentoo'`.
 * If configure failed with a 'cannot run C compiled programs' error, try this:
 * FEATURES='-sandbox -usersandbox' emerge sandbox
 * The complete build log is located at '/var/tmp/portage/sys-apps/sandbox-2.16/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-apps/sandbox-2.16/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16-abi_x86_64.amd64'
 * S: '/var/tmp/portage/sys-apps/sandbox-2.16/work/sandbox-2.16'