does not build in Arch, please help

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==> Starting build()...
Submodule 'src/lib/qdocker' (https://github.com/Shadowsith/qdocker) registered for path 'src/lib/qdocker'
Cloning into '/home/z/.cache/yay/qpicospeaker-git/src/qpicospeaker/src/lib/qdocker'...
Submodule path 'src/lib/qdocker': checked out '0be78c3e34f7b344425f835e49792004a8652788'
Info: creating stash file /home/z/.cache/yay/qpicospeaker-git/src/build/.qmake.stash
/usr/bin/uic ../qpicospeaker/src/qpicospeaker.ui -o ui_qpicospeaker.h
/usr/bin/uic ../qpicospeaker/src/aboutinfo.ui -o ui_aboutinfo.h
/usr/bin/uic ../qpicospeaker/src/settings.ui -o ui_settings.h
g++ -c -pipe -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -Wp,-D_GLIBCXX_ASSERTIONS -flto -fno-fat-lto-objects -Wall -Wextra -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_MULTIMEDIA_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../qpicospeaker -I. -I/usr/include/qt -I/usr/include/qt/QtMultimedia -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtGui -I/usr/include/qt/QtNetwork -I/usr/include/qt/QtCore -I. -I. -I/usr/lib/qt/mkspecs/linux-g++ -o texttospeech.o ../qpicospeaker/src/texttospeech.cpp
g++ -c -pipe -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -Wp,-D_GLIBCXX_ASSERTIONS -flto -fno-fat-lto-objects -Wall -Wextra -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_MULTIMEDIA_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../qpicospeaker -I. -I/usr/include/qt -I/usr/include/qt/QtMultimedia -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtGui -I/usr/include/qt/QtNetwork -I/usr/include/qt/QtCore -I. -I. -I/usr/lib/qt/mkspecs/linux-g++ -o aboutinfo.o ../qpicospeaker/src/aboutinfo.cpp
../qpicospeaker/src/texttospeech.cpp: In member function ‘bool TextToSpeech::checkProgram(std::string)’:
../qpicospeaker/src/texttospeech.cpp:117:27: error: aggregate ‘std::array<char, 128> buffer’ has incomplete type and cannot be defined
117 | std::array<char, 128> buffer;
| ^~~~~~
../qpicospeaker/src/texttospeech.cpp: In member function ‘void TextToSpeech::recordFiles()’:
../qpicospeaker/src/texttospeech.cpp:80:20: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
80 | std::system(_cmd.c_str());
| ~~~~~~~~~~~^~~~~~~~~~~~~~
../qpicospeaker/src/texttospeech.cpp: In member function ‘void TextToSpeech::clearTmp()’:
../qpicospeaker/src/texttospeech.cpp:142:16: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
142 | std::system(_cmd.c_str());
| ~~~~~~~~~~~^~~~~~~~~~~~~~
../qpicospeaker/src/texttospeech.cpp: In member function ‘void TextToSpeech::createAudio()’:
../qpicospeaker/src/texttospeech.cpp:152:24: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
152 | std::system(_cmd.c_str());
| ~~~~~~~~~~~^~~~~~~~~~~~~~
../qpicospeaker/src/texttospeech.cpp:158:24: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
158 | std::system(_cmd.c_str());
| ~~~~~~~~~~~^~~~~~~~~~~~~~
../qpicospeaker/src/texttospeech.cpp: In member function ‘void TextToSpeech::setSpeedAndPitch()’:
../qpicospeaker/src/texttospeech.cpp:165:16: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
165 | std::system(_cmd.c_str());
| ~~~~~~~~~~~^~~~~~~~~~~~~~
make: *** [Makefile:848: texttospeech.o] Error 1
make: *** Waiting for unfinished jobs....
==> ERROR: A failure occurred in build().
Aborting...
-> error making: qpicospeaker-git-exit status 4