Description of problem:
Package dtkcore fails to build from source in Fedora Rawhide.

Version-Release number of selected component (if applicable):
5.5.30-5.fc38

Steps to Reproduce:
koji build --scratch f38 dtkcore-5.5.30-5.fc38.src.rpm

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/dtkcore

In file included from /usr/include/c++/13/x86_64-redhat-linux/bits/os_defines.h:39,
                 from /usr/include/c++/13/x86_64-redhat-linux/bits/c++config.h:2920,
                 from /usr/include/c++/13/cstddef:49,
                 from /usr/include/gtest/gtest.h:52,
                 from ut_dutil.h:20,
                 from main.cpp:18:
/usr/include/features.h:412:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
  412 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
      |    ^~~~~~~
In file included from /usr/include/gtest/gtest-message.h:57,
                 from /usr/include/gtest/gtest-assertion-result.h:46,
                 from /usr/include/gtest/gtest.h:64:
/usr/include/gtest/internal/gtest-port.h:270:2: error: #error C++ versions less than C++14 are not supported.

In gtest 1.13.0, support for C++ standards older than C++14 was dropped. You will have to build deepin-network-utils with C++14 or later in order to use the system copy of gtest.