* Package:    www-servers/varnish-6.3.2
 * Repository: gentoo
 * Maintainer: blueness@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_musl kernel_linux python_targets_python3_6 userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking varnish-6.3.2.tgz to /var/tmp/portage/www-servers/varnish-6.3.2/work
>>> Source unpacked in /var/tmp/portage/www-servers/varnish-6.3.2/work
>>> Preparing source in /var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2 ...
 * Running eautoreconf in '/var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2' ...
 * Running libtoolize --install --copy --force --automake ...
 [ ok ]
 * Running aclocal -I m4 -I . ...
 [ ok ]
 * Running autoconf --force ...
 [ ok ]
 * Running autoheader ...
 [ ok ]
 * Running automake --add-missing --copy --foreign --force-missing ...
 [ ok ]
 * Running elibtoolize in: varnish-6.3.2/
 * Running elibtoolize in: varnish-6.3.2/build-aux/
 *   Applying portage/1.2.0 patch ...
 *   Applying sed/1.5.6 patch ...
 *   Applying as-needed/2.4.3 patch ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2 ...
 * econf: updating varnish-6.3.2/build-aux/config.sub with /usr/share/gnuconfig/config.sub
 * econf: updating varnish-6.3.2/build-aux/config.guess with /usr/share/gnuconfig/config.guess
./configure --prefix=/usr --build=x86_64-gentoo-linux-musl --host=x86_64-gentoo-linux-musl --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/varnish-6.3.2 --htmldir=/usr/share/doc/varnish-6.3.2/html --with-sysroot=/ --libdir=/usr/lib --disable-static --disable-pcre-jit --without-jemalloc
checking for x86_64-gentoo-linux-musl-gcc... x86_64-gentoo-linux-musl-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-gentoo-linux-musl-gcc accepts -g... yes
checking for x86_64-gentoo-linux-musl-gcc option to accept ISO C89... none needed
checking whether x86_64-gentoo-linux-musl-gcc understands -c and -o together... yes
checking how to run the C preprocessor... x86_64-gentoo-linux-musl-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
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checking whether it is safe to define __EXTENSIONS__... yes
checking build system type... x86_64-gentoo-linux-musl
checking host system type... x86_64-gentoo-linux-musl
checking target system type... x86_64-gentoo-linux-musl
checking whether to enable maintainer-specific portions of Makefiles... no
checking for a BSD-compatible install... /usr/lib/portage/python3.6/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 the include directive... yes (GNU style)
checking whether make supports nested variables... yes
checking dependency style of x86_64-gentoo-linux-musl-gcc... none
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checking if the linker (/usr/x86_64-gentoo-linux-musl/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/x86_64-gentoo-linux-musl-nm -B
checking the name lister (/usr/bin/x86_64-gentoo-linux-musl-nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 98304
checking how to convert x86_64-gentoo-linux-musl file names to x86_64-gentoo-linux-musl format... func_convert_file_noop
checking how to convert x86_64-gentoo-linux-musl file names to toolchain format... func_convert_file_noop
checking for /usr/x86_64-gentoo-linux-musl/bin/ld option to reload object files... -r
checking for x86_64-gentoo-linux-musl-objdump... x86_64-gentoo-linux-musl-objdump
checking how to recognize dependent libraries... pass_all
checking for x86_64-gentoo-linux-musl-dlltool... no
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checking how to associate runtime and link libraries... printf %s\n
checking for x86_64-gentoo-linux-musl-ar... x86_64-gentoo-linux-musl-ar
checking for archiver @FILE support... @
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checking for x86_64-gentoo-linux-musl-ranlib... x86_64-gentoo-linux-musl-ranlib
checking command to parse /usr/bin/x86_64-gentoo-linux-musl-nm -B output from x86_64-gentoo-linux-musl-gcc object... ok
checking for sysroot... /
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checking how to truncate binary pipes... /bin/dd bs=4096 count=1
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checking if x86_64-gentoo-linux-musl-gcc PIC flag -fPIC -DPIC works... yes
checking if x86_64-gentoo-linux-musl-gcc static flag -static works... yes
checking if x86_64-gentoo-linux-musl-gcc supports -c -o file.o... yes
checking if x86_64-gentoo-linux-musl-gcc supports -c -o file.o... (cached) yes
checking whether the x86_64-gentoo-linux-musl-gcc linker (/usr/x86_64-gentoo-linux-musl/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
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checking for x86_64-gentoo-linux-musl-gcc... (cached) x86_64-gentoo-linux-musl-gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether x86_64-gentoo-linux-musl-gcc accepts -g... (cached) yes
checking for x86_64-gentoo-linux-musl-gcc option to accept ISO C89... (cached) none needed
checking whether x86_64-gentoo-linux-musl-gcc understands -c and -o together... (cached) yes
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checking whether x86_64-gentoo-linux-musl-gcc is Clang... no
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checking for dot... no
configure: WARNING: dot not found - build will fail if svg files are out of date.
checking for a Python interpreter with version >= 3.4... python3.8
checking for python3.8... /usr/bin/python3.8
checking for python3.8 version... 3.8
checking for python3.8 platform... linux
checking for python3.8 script directory... ${prefix}/lib/python3.8/site-packages
checking for python3.8 extension module directory... ${exec_prefix}/lib/python3.8/site-packages
checking for library containing pthread_create... none required
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configure: error: Could not find backtrace() support

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2/config.log
 * ERROR: www-servers/varnish-6.3.2::gentoo failed (configure phase):
 *   econf failed
 * 
 * Call stack:
 *               ebuild.sh, line  125:  Called src_configure
 *             environment, line 2641:  Called econf '--disable-static' '--disable-pcre-jit' '--without-jemalloc'
 *        phase-helpers.sh, line  681:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  112:  Called die
 * The specific snippet of code:
 *   		die "$@"
 * 
 * If you need support, post the output of `emerge --info '=www-servers/varnish-6.3.2::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=www-servers/varnish-6.3.2::gentoo'`.
 * The complete build log is located at '/var/log/portage/www-servers:varnish-6.3.2:20200314-120149.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/www-servers/varnish-6.3.2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/www-servers/varnish-6.3.2/temp/environment'.
 * Working directory: '/var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2'
 * S: '/var/tmp/portage/www-servers/varnish-6.3.2/work/varnish-6.3.2'