Can't compile Qt for Webassembly

vadi@gooseberry:/media/vadi/SSDer/Programs/Qt/5.14.0/Src$ ./configure -xplatform wasm-emscripten -nomake examples -prefix $PWD/qtbase -feature-thread
+ cd qtbase
+ /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/configure -top-level -xplatform wasm-emscripten -nomake examples -prefix /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase -feature-thread
Creating qmake...
.............................................................................................Done.
Info: creating super cache file /media/vadi/SSDer/Programs/Qt/5.14.0/Src/.qmake.super
Info: creating cache file /media/vadi/SSDer/Programs/Qt/5.14.0/Src/.qmake.cache
Info: creating stash file /media/vadi/SSDer/Programs/Qt/5.14.0/Src/.qmake.stashSelecting Qt Edition.Type 'c' if you want to use the Commercial Edition.
Type 'o' if you want to use the Open Source Edition.Which edition of Qt do you want to use? oThis is the Qt Open Source Edition.
 
You are licensed to use this software under the terms of
the GNU General Public License (GPL) version 3.
 
Type 'G' to view the GNU General Public License version 3 (GPLv3).
Type 'y' to accept this license offer.
Type 'n' to decline this license offer.
 
Do you accept the terms of the license? y
Running configuration tests...
Checking for valid makespec... Note: Also available for Linux: linux-clang linux-iccERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.Check config.log for details.
vadi@gooseberry:/media/vadi/SSDer/Programs/Qt/5.14.0/Src$ cat config
config.cache    config.log      config.tests/   configure       configure.bat   configure.json  
vadi@gooseberry:/media/vadi/SSDer/Programs/Qt/5.14.0/Src$ cat config.log
Command line: -xplatform wasm-emscripten -nomake examples -prefix /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase -feature-thread
executing config test verifyspec
+ cd /media/vadi/SSDer/Programs/Qt/5.14.0/Src/config.tests/verifyspec && /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += static warn_off console single_arch" -early "CONFIG += cross_compile" /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/config.tests/verifyspec
+ cd /media/vadi/SSDer/Programs/Qt/5.14.0/Src/config.tests/verifyspec && MAKEFLAGS= /usr/bin/make
> em++ -c -pipe -O3 -std=gnu++11 -w  -I/media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/config.tests/verifyspec -I. -I/home/vadi/.emscripten_ports/openssl/include -I/media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/mkspecs/wasm-emscripten -o verifyspec.o /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/config.tests/verifyspec/verifyspec.cpp
> sed -e s/@APPNAME@/verifyspec/g /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/mkspecs/features/wasm/../../../src/plugins/platforms/wasm/wasm_shell.html > /media/vadi/SSDer/Programs/Qt/5.14.0/Src/config.tests/verifyspec/verifyspec.html
> cp -f /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/mkspecs/features/wasm/../../../src/plugins/platforms/wasm/qtloader.js /media/vadi/SSDer/Programs/Qt/5.14.0/Src/config.tests/verifyspec
> cp -f /media/vadi/SSDer/Programs/Qt/5.14.0/Src/qtbase/mkspecs/features/wasm/../../../src/plugins/platforms/wasm/qtlogo.svg /media/vadi/SSDer/Programs/Qt/5.14.0/Src/config.tests/verifyspec
> em++ -s WASM=1 -s FULL_ES2=1 -s USE_WEBGL2=1 -s NO_EXIT_RUNTIME=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 --bind -O3 -o ./verifyspec.js verifyspec.o      
> cache:INFO: generating system library: libc.bc... (this will be cached in "/home/vadi/.emscripten_cache/asmjs/libc.bc" for subsequent builds)
> cache:INFO:  - ok
> cache:INFO: generating system library: libcompiler_rt.bc... (this will be cached in "/home/vadi/.emscripten_cache/asmjs/libcompiler_rt.bc" for subsequent builds)
> cache:INFO:  - ok
> cache:INFO: generating system library: libc-wasm.bc... (this will be cached in "/home/vadi/.emscripten_cache/asmjs/libc-wasm.bc" for subsequent builds)
> cache:INFO:  - ok
> cache:INFO: generating system library: libembind-rtti.bc... (this will be cached in "/home/vadi/.emscripten_cache/asmjs/libembind-rtti.bc" for subsequent builds)
> cache:INFO:  - ok
> cache:INFO: generating system library: libc++abi-noexcept.bc... (this will be cached in "/home/vadi/.emscripten_cache/asmjs/libc++abi-noexcept.bc" for subsequent builds)
> In file included from /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_default_handlers.cpp:19:
> /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_exception.hpp:19:10: fatal error: 'unwind.h' file not found
> #include "unwind.h"
>          ^~~~~~~~~~
> 1 error generated.
> shared:ERROR: '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=39 -D__EMSCRIPTEN_tiny__=2 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libcxx -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/compat -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/local/include -c -Werror -std=c++11 -Oz -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -fno-exceptions -DNDEBUG -D_LIBCXXABI_HAS_NO_THREADS -D_LIBCXXABI_NO_EXCEPTIONS -DEMSCRIPTEN -mllvm -disable-llvm-optzns /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_default_handlers.cpp -fno-inline-functions -Xclang -disable-O0-optnone -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/SDL -c -o /tmp/emscripten_temp_o9uCTf/cxa_default_handlers.cpp.o -emit-llvm' failed (1)
> In file included from /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_exception_storage.cpp:14:
> /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_exception.hpp:19:10: fatal error: 'unwind.h' file not found
> #include "unwind.h"
>          ^~~~~~~~~~
> 1 error generated.
> shared:ERROR: '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=39 -D__EMSCRIPTEN_tiny__=2 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libcxx -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/compat -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/local/include -c -Werror -std=c++11 -Oz -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -fno-exceptions -DNDEBUG -D_LIBCXXABI_HAS_NO_THREADS -D_LIBCXXABI_NO_EXCEPTIONS -DEMSCRIPTEN -mllvm -disable-llvm-optzns /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_exception_storage.cpp -fno-inline-functions -Xclang -disable-O0-optnone -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/SDL -c -o /tmp/emscripten_temp_o9uCTf/cxa_exception_storage.cpp.o -emit-llvm' failed (1)
> Traceback (most recent call last):
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/emcc.py", line 3681, in <module>
>     sys.exit(run(sys.argv))
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/emcc.py", line 2074, in run
>     extra_files_to_link += system_libs.calculate([f for _, f in sorted(temp_files)] + extra_files_to_link, in_temp, stdout_=None, stderr_=None, forced=forced_stdlibs)
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 1424, in calculate
>     add_library(lib)
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 1384, in add_library
>     add_library(system_libs_map[d])
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 1380, in add_library
>     libs_to_link.append((lib.get_path(), need_whole_archive))
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 310, in get_path
>     return shared.Cache.get(self.get_filename(), self.build)
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/cache.py", line 133, in get
>     temp = creator()
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 350, in build
>     create_lib(out_filename, self.build_objects())
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 344, in build_objects
>     run_commands(commands)
>   File "/home/vadi/Programs/emsdk/upstream/emscripten/tools/system_libs.py", line 69, in run_commands
>     pool.map_async(run_build_command, commands, chunksize=1).get(999999)
>   File "/usr/lib/python2.7/multiprocessing/pool.py", line 572, in get
>     raise self._value
> tools.shared.Py2CalledProcessError: Command '['/usr/bin/python', '/home/vadi/Programs/emsdk/upstream/emscripten/em++.py', '-s', 'WASM_OBJECT_FILES=0', '-c', '/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_default_handlers.cpp', '-o', '/tmp/emscripten_temp_o9uCTf/cxa_default_handlers.cpp.o', '-Werror', '-std=c++11', '-Oz', '-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS', '-s', 'WASM_OBJECT_FILES=0', '-fno-exceptions', '-DNDEBUG', '-D_LIBCXXABI_HAS_NO_THREADS', '-D_LIBCXXABI_NO_EXCEPTIONS']' returned non-zero exit status 1
> In file included from /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_handlers.cpp:19:
> /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_exception.hpp:19:10: fatal error: 'unwind.h' file not found
> #include "unwind.h"
>          ^~~~~~~~~~
> make: *** [Makefile:69: verifyspec.js] Error 1
> error: unable to rename temporary '/tmp/emscripten_temp_o9uCTf/cxa_demangle.cpp-10fe72fc.o.tmp' to output file '/tmp/emscripten_temp_o9uCTf/cxa_demangle.cpp.o': 'No such file or directory'
> 1 error generated.
> shared:ERROR: '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=39 -D__EMSCRIPTEN_tiny__=2 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libcxx -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/compat -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/local/include -c -Werror -std=c++11 -Oz -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -fno-exceptions -DNDEBUG -D_LIBCXXABI_HAS_NO_THREADS -D_LIBCXXABI_NO_EXCEPTIONS -DEMSCRIPTEN -mllvm -disable-llvm-optzns /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_demangle.cpp -fno-inline-functions -Xclang -disable-O0-optnone -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/SDL -c -o /tmp/emscripten_temp_o9uCTf/cxa_demangle.cpp.o -emit-llvm' failed (1)
> 1 error generated.
> shared:ERROR: '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=39 -D__EMSCRIPTEN_tiny__=2 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libcxx -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/compat -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/libc -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/local/include -c -Werror -std=c++11 -Oz -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -fno-exceptions -DNDEBUG -D_LIBCXXABI_HAS_NO_THREADS -D_LIBCXXABI_NO_EXCEPTIONS -DEMSCRIPTEN -mllvm -disable-llvm-optzns /home/vadi/Programs/emsdk/upstream/emscripten/system/lib/libcxxabi/src/cxa_handlers.cpp -fno-inline-functions -Xclang -disable-O0-optnone -Xclang -isystem/home/vadi/Programs/emsdk/upstream/emscripten/system/include/SDL -c -o /tmp/emscripten_temp_o9uCTf/cxa_handlers.cpp.o -emit-llvm' failed (1)

$ cat ~/.emscripten
LLVM_ROOT = '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit'
EMSCRIPTEN_NATIVE_OPTIMIZER = '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/optimizer'
BINARYEN_ROOT = '/home/vadi/Programs/emsdk/clang/e1.38.30_64bit/binaryen'
NODE_JS = '/home/vadi/Programs/emsdk/node/8.9.1_64bit/bin/node'
EMSCRIPTEN_ROOT = '/home/vadi/Programs/emsdk/emscripten/1.38.30'
TEMP_DIR = '/tmp'
COMPILER_ENGINE = NODE_JS
JS_ENGINES = [NODE_JS]