For CentOS7 upgrade is not possible. The compiler does not support class `std::unique_ptr`.
``` [ 29%] Building CXX object CMakeFiles/phonenumber.dir/src/phonenumbers/phonenumbermatcher.cc.o /usr/bin/c++ -DI18N_PHONENUMBERS_USE_ALTERNATE_FORMATS -DI18N_PHONENUMBERS_USE_BOOST -DI18N_PHONENUMBERS_USE_ICU_REGEXP -DI18N_PHONENUMBERS_USE_TR1_UNORDERED_MAP -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -I/root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src -I/root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/test -Wall -Werror -o CMakeFiles/phonenumber.dir/src/phonenumbers/phonenumbermatcher.cc.o -c /root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src/phonenumbers/phonenumbermatcher.cc /root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src/phonenumbers/phonenumbermatcher.cc: In member function 'bool i18n::phonenumbers::PhoneNumberMatcher::CheckNumberGroupingIsValid(const i18n::phonenumbers::PhoneNumber&, const string&, i18n::phonenumbers::ResultCallback4<bool, const i18n::phonenumbers::PhoneNumberUtil&, const i18n::phonenumbers::PhoneNumber&, const std::basic_string<char>&, const std::vector<std::basic_string<char> >&>*) const': /root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src/phonenumbers/phonenumbermatcher.cc:704:9: error: 'unique_ptr' is not a member of 'std' std::unique_ptr<RegExpInput> nsn_input( ^ /root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src/phonenumbers/phonenumbermatcher.cc:704:36: error: expected primary-expression before '>' token std::unique_ptr<RegExpInput> nsn_input( ^ /root/rpmbuild/BUILD/libphonenumber-8.12.11/cpp/src/phonenumbers/phonenumbermatcher.cc:706:45: error: 'nsn_input' was not declared in this scope national_significant_number)); ^ gmake[2]: *** [CMakeFiles/phonenumber.dir/src/phonenumbers/phonenumbermatcher.cc.o] Error 1 gmake[2]: Leaving directory `/root/rpmbuild/BUILD/libphonenumber-8.12.11' gmake[1]: Leaving directory `/root/rpmbuild/BUILD/libphonenumber-8.12.11' gmake[1]: *** [CMakeFiles/phonenumber.dir/all] Error 2 gmake: *** [all] Error 2 error: Bad exit status from /var/tmp/rpm-tmp.sVbi0F (%build) Downloading https://github.com/google/libphonenumber/archive/v8.12.11/libphonenumber-8.1... to /root/rpmbuild/SOURCES/libphonenumber-8.12.11.tar.gz Bad exit status from /var/tmp/rpm-tmp.sVbi0F (%build) ```
Here, for you possible options: 1) update CentOS 7 to CentOS 8; 2) update gcc compiler on CentOS7 and create a custom `libphonenumber` and `kamailio` build.
CentOS 8 available [here](http://rpm.kamailio.org/centos/8/master/master/x86_64/Packages/l/). The second option you can do yourself. We cannot use a not standard compiler on the project.