View Compilation Error

0_0_2957383_6813.cpp: In function `long unsigned int kgcd(long unsigned int, long unsigned int)':
0_0_2957383_6813.cpp:12: error: call of overloaded `abs(long unsigned int)' is ambiguous
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/stdlib.h:363: note: candidates are: int abs(int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:153: note:                 long long int __gnu_cxx::abs(long long int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:123: note:                 long int std::abs(long int)