Compilation failed.

[Jerry-Freelancer]

CentOS 7.9

[ 50%] Building CXX object CMakeFiles/sdi2ddl.dir/src/sdi2ddl.cc.o
In file included from /usr/include/c++/4.8.2/unordered_map:35:0,
from /root/sdi2ddl-main/src/sdi2ddl.cc:3:
/usr/include/c++/4.8.2/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
#error This file requires compiler and library support for the
^
In file included from /root/sdi2ddl-main/src/sdi2ddl.cc:4:0:
/root/sdi2ddl-main/src/include/collations.h:20:1: error: ‘unordered_map’ does not name a type
unordered_map<int, collation_info> collation_map;
^
/root/sdi2ddl-main/src/include/collations.h: In function ‘bool find_collation(const int&, collation_info&)’:
/root/sdi2ddl-main/src/include/collations.h:34:8: error: ‘it’ does not name a type
auto it = collation_map.find(id);
^
/root/sdi2ddl-main/src/include/collations.h:35:7: error: ‘it’ was not declared in this scope
if (it == collation_map.end()) {
^
/root/sdi2ddl-main/src/include/collations.h:35:13: error: ‘collation_map’ was not declared in this scope
if (it == collation_map.end()) {
^
/root/sdi2ddl-main/src/include/collations.h:38:15: error: ‘it’ was not declared in this scope
collation = it->second;