www/qt5-webengine fails to compile on my machine with the following message:

(...)

-I/wrkdirs/usr/ports/www/qt5-webengine/work/qtwebengine-opensource-src-5.7.1/src/3rdparty/chromium/third_party/boringssl/src/include
-fstack-protector --param=ssp-buffer-size=4 -pthread -fno-strict-aliasing -Wall
-Wextra -Wno-unused-parameter -Wno-missing-field-initializers
-fvisibility=hidden -pipe -fPIC -fcolor-diagnostics -Wheader-hygiene
-Wno-char-subscripts -Wno-unneeded-internal-declaration
-Wno-covered-switch-default -Wstring-conversion -Wno-c++11-narrowing
-Wno-deprecated-register -Wno-inconsistent-missing-override
-Wno-tautological-compare -Wno-unknown-warning-option -Wexit-time-destructors
-I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include
-I/usr/local/include -pthread -I/usr/local/include/opus
-I/usr/local/include/libpng16 -I/usr/local/include -I/usr/local/include
-I/usr/local/include/freetype2 -I/usr/local/include -D_THREAD_SAFE -pthread -m64
-march=x86-64 -O2 -fno-ident -fdata-sections -ffunction-sections -funwind-tables
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -O2 -pipe -march=native -DHARDENEDBSD
-fPIE -fPIC -fstack-protector -fno-strict-aliasing -DHARDENEDBSD -fPIE -fPIC
-fno-exceptions -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden
-std=gnu++11 -stdlib=libc++ -c
/wrkdirs/usr/ports/www/qt5-webengine/work/qtwebengine-opensource-src-5.7.1/src/3rdparty/chromium/content/common/experiments/api_key.cc
-o obj/src/3rdparty/chromium/content/common/experiments/content_common.api_key.o
/wrkdirs/usr/ports/www/qt5-webengine/work/qtwebengine-opensource-src-5.7.1/src/3rdparty/chromium/content/common/experiments/api_key.cc:137:16:
error: use of undeclared identifier 'ED25519_verify' int result =
ED25519_verify( ^


1 error generated.
[10640/11263] CXX obj/src/3rdparty/chromium/content/common/content_common.cc_messages.o
[10641/11263] CXX obj/src/3rdparty/chromium/content/common/cursors/content_common.webcursor.o
[10642/11263] CXX obj/src/3rdparty/chromium/content/common/content_common.content_param_traits.o
[10643/11263] CXX obj/src/3rdparty/chromium/content/common/content_common.content_switches_internal.o
[10644/11263] CXX obj/src/3rdparty/chromium/content/common/content_common.cross_site_document_classifier.o
[10645/11263] CXX obj/src/3rdparty/chromium/content/common/content_common.content_message_generator.o
ninja: build stopped: subcommand failed.
*** [invoke_ninja] Error code 1

make[4]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src/core
1 error

make[4]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src/core
*** [sub-gyp_run-pro-make_first] Error code 2

make[3]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src/core
1 error

make[3]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src/core
*** [sub-core-make_first] Error code 2

make[2]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src
1 error

make[2]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build/src
*** [sub-src-make_first] Error code 2

make[1]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build
1 error

make[1]: stopped in /wrkdirs/usr/ports/www/qt5-webengine/work/.build
===> Compilation failed unexpectedly.