Such error occurs when trying to install pysinsy. Should I then add a flag somewhere like "--std=c++14"?

Building wheels for collected packages: pysinsy
Building wheel for pysinsy (pyproject.toml) ... error
error: subprocess-exited-with-error

× Building wheel for pysinsy (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [152 lines of output]
fatal: not a git repository (or any of the parent directories): .git
running bdist_wheel
running build
running build_py
-- Building version 0.0.4
creating build
creating build/lib.linux-x86_64-3.8
creating build/lib.linux-x86_64-3.8/pysinsy
copying pysinsy/version.py -> build/lib.linux-x86_64-3.8/pysinsy
copying pysinsy/init.py -> build/lib.linux-x86_64-3.8/pysinsy
creating build/lib.linux-x86_64-3.8/pysinsy/htsvoice
copying pysinsy/htsvoice/COPYING -> build/lib.linux-x86_64-3.8/pysinsy/htsvoice
copying pysinsy/htsvoice/nitech_jp_song070_f001.htsvoice -> build/lib.linux-x86_64-3.8/pysinsy/htsvoice
creating build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.euc_jp.table -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.macron -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.utf_8.table -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.shift_jis.table -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/COPYING -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.shift_jis.conf -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.euc_jp.conf -> build/lib.linux-x86_64-3.8/pysinsy/_dic
copying pysinsy/_dic/japanese.utf_8.conf -> build/lib.linux-x86_64-3.8/pysinsy/_dic
running build_ext
skipping 'pysinsy/sinsy.cpp' Cython extension (up-to-date)
building 'pysinsy.sinsy' extension
creating build/temp.linux-x86_64-3.8
creating build/temp.linux-x86_64-3.8/pysinsy
creating build/temp.linux-x86_64-3.8/lib
creating build/temp.linux-x86_64-3.8/lib/sinsy
creating build/temp.linux-x86_64-3.8/lib/sinsy/src
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/converter
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/japanese
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/label
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/score
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/temporary
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/util
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/xml
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/hts_engine_API
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/hts_engine_API/hts_engine
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/hts_engine_API/hts_engine/src
creating build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/hts_engine_API/hts_engine/src/lib
x86_64-linux-gnu-gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/converter -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/japanese -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/label -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/score -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/temporary -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/xml -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/hts_engine_API -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/hts_engine_API/hts_engine/src/lib -Ilib/sinsy/src/include/sinsy -Ilib/sinsy/src/lib/hts_engine_API/hts_engine/src/include -I/home/lutxang/vv/include -I/usr/include/python3.8 -c pysinsy/sinsy.cpp -o build/temp.linux-x86_64-3.8/pysinsy/sinsy.o
In file included from /tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822,
from /tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include/numpy/ndarrayobject.h:12,
from /tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include/numpy/arrayobject.h:4,
from pysinsy/sinsy.cpp:695:
/tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: #warning "Using deprecated NumPy API, disable it with " "#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
17 | #warning "Using deprecated NumPy API, disable it with "
| ^~~~~~~
pysinsy/sinsy.cpp: In function ‘PyObject* __pyx_pf_7pysinsy_5sinsy_12LabelStrings_getData(__pyx_obj_7pysinsy_5sinsy_LabelStrings*)’:
pysinsy/sinsy.cpp:2078:33: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
2078 | for (__pyx_t_4 = 0; __pyx_t_4 < __pyx_t_3; __pyx_t_4+=1) {
| ~~~~~~~~~~^~~~~~~~~~~
x86_64-linux-gnu-gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/tmp/pip-build-env-h9gx3vey/overlay/lib/python3.8/site-packages/numpy/core/include -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/converter -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/japanese -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/label -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/score -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/temporary -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/xml -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/hts_engine_API -I/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/hts_engine_API/hts_engine/src/lib -Ilib/sinsy/src/include/sinsy -Ilib/sinsy/src/lib/hts_engine_API/hts_engine/src/include -I/home/lutxang/vv/include -I/usr/include/python3.8 -c lib/sinsy/src/lib/Sinsy.cpp -o build/temp.linux-x86_64-3.8/lib/sinsy/src/lib/Sinsy.o
In file included from /tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/xml/XmlReader.h:50,
from lib/sinsy/src/lib/Sinsy.cpp:47:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/xml/XmlParser.h:62:66: error: ISO C++17 does not allow dynamic exception specifications
62 | XmlData* read(IReadableStream& stream, std::string& encoding) throw (StreamException);
| ^~~~~
In file included from /tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/InputFile.h:47,
from lib/sinsy/src/lib/Sinsy.cpp:49:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:64:51: error: ISO C++17 does not allow dynamic exception specifications
64 | virtual size_t read(void* buffer, size_t byte) throw (StreamException) = 0;
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:71:62: error: ISO C++17 does not allow dynamic exception specifications
71 | IReadableStream& fromStream(IReadableStream& stream, T& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:88:72: error: ISO C++17 does not allow dynamic exception specifications
88 | inline IReadableStream& operator>>(IReadableStream& stream, char& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:96:81: error: ISO C++17 does not allow dynamic exception specifications
96 | inline IReadableStream& operator>>(IReadableStream& stream, unsigned char& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:104:73: error: ISO C++17 does not allow dynamic exception specifications
104 | inline IReadableStream& operator>>(IReadableStream& stream, INT16& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:112:74: error: ISO C++17 does not allow dynamic exception specifications
112 | inline IReadableStream& operator>>(IReadableStream& stream, UINT16& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:120:73: error: ISO C++17 does not allow dynamic exception specifications
120 | inline IReadableStream& operator>>(IReadableStream& stream, INT32& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:128:74: error: ISO C++17 does not allow dynamic exception specifications
128 | inline IReadableStream& operator>>(IReadableStream& stream, UINT32& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:136:73: error: ISO C++17 does not allow dynamic exception specifications
136 | inline IReadableStream& operator>>(IReadableStream& stream, INT64& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:144:74: error: ISO C++17 does not allow dynamic exception specifications
144 | inline IReadableStream& operator>>(IReadableStream& stream, UINT64& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:152:73: error: ISO C++17 does not allow dynamic exception specifications
152 | inline IReadableStream& operator>>(IReadableStream& stream, float& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:160:74: error: ISO C++17 does not allow dynamic exception specifications
160 | inline IReadableStream& operator>>(IReadableStream& stream, double& buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IReadableStream.h:168:79: error: ISO C++17 does not allow dynamic exception specifications
168 | inline IReadableStream& operator>>(IReadableStream& stream, long double& buf) throw (StreamException)
| ^~~~~
In file included from lib/sinsy/src/lib/Sinsy.cpp:49:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/InputFile.h:65:43: error: ISO C++17 does not allow dynamic exception specifications
65 | size_t read(void* buffer, size_t size) throw (StreamException);
| ^~~~~
In file included from /tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/OutputFile.h:47,
from lib/sinsy/src/lib/Sinsy.cpp:50:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:63:58: error: ISO C++17 does not allow dynamic exception specifications
63 | virtual size_t write(const void* buffer, size_t byte) throw (StreamException) = 0;
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:87:71: error: ISO C++17 does not allow dynamic exception specifications
87 | inline IWritableStream& operator<<(IWritableStream& stream, char buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:95:80: error: ISO C++17 does not allow dynamic exception specifications
95 | inline IWritableStream& operator<<(IWritableStream& stream, unsigned char buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:103:72: error: ISO C++17 does not allow dynamic exception specifications
103 | inline IWritableStream& operator<<(IWritableStream& stream, INT16 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:111:73: error: ISO C++17 does not allow dynamic exception specifications
111 | inline IWritableStream& operator<<(IWritableStream& stream, UINT16 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:119:72: error: ISO C++17 does not allow dynamic exception specifications
119 | inline IWritableStream& operator<<(IWritableStream& stream, INT32 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:127:73: error: ISO C++17 does not allow dynamic exception specifications
127 | inline IWritableStream& operator<<(IWritableStream& stream, UINT32 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:135:72: error: ISO C++17 does not allow dynamic exception specifications
135 | inline IWritableStream& operator<<(IWritableStream& stream, INT64 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:143:73: error: ISO C++17 does not allow dynamic exception specifications
143 | inline IWritableStream& operator<<(IWritableStream& stream, UINT64 buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:151:72: error: ISO C++17 does not allow dynamic exception specifications
151 | inline IWritableStream& operator<<(IWritableStream& stream, float buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:159:73: error: ISO C++17 does not allow dynamic exception specifications
159 | inline IWritableStream& operator<<(IWritableStream& stream, double buf) throw (StreamException)
| ^~~~~
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/IWritableStream.h:167:78: error: ISO C++17 does not allow dynamic exception specifications
167 | inline IWritableStream& operator<<(IWritableStream& stream, long double buf) throw (StreamException)
| ^~~~~
In file included from lib/sinsy/src/lib/Sinsy.cpp:50:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/OutputFile.h:65:50: error: ISO C++17 does not allow dynamic exception specifications
65 | size_t write(const void* buffer, size_t size) throw (StreamException);
| ^~~~~
In file included from lib/sinsy/src/lib/Sinsy.cpp:51:
/tmp/pip-install-vrpjnsjk/pysinsy_1382a75bd0274b62b2133d4989331d6a/lib/sinsy/src/lib/util/WritableStrStream.h:67:48: error: ISO C++17 does not allow dynamic exception specifications
67 | WritableStrStream& operator<<(const T& buf) throw (StreamException) {
| ^~~~~
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for pysinsy
Failed to build pysinsy
ERROR: Could not build wheels for pysinsy, which is required to install pyproject.toml-based projects