View Compilation Error

0_0_27173821_26351.cpp: In function 'bool check(int, int, int, int)':
0_0_27173821_26351.cpp:10:10: error: 'sqrtl' is not a member of 'std'
  delta = std::sqrtl(delta);
          ^
0_0_27173821_26351.cpp:10:10: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_27173821_26351.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:744:22: note:   'sqrtl'
   extern long double sqrtl(long double);
                      ^