foo.cpp: In function 'void maketree(FBI*, char*, int)':
foo.cpp:19:17: error: 'strstr' was not declared in this scope
foo.cpp:31:19: error: 'strncpy' was not declared in this scope
foo.cpp:36:16: error: 'strstr' was not declared in this scope
foo.cpp:44:16: error: 'strstr' was not declared in this scope
foo.cpp: In function 'int main()':
foo.cpp:57:16: error: 'scanf' was not declared in this scope
foo.cpp:58:14: error: 'strlen' was not declared in this scope
foo.cpp:59:20: error: 'strcmp' was not declared in this scope
foo.cpp:67:17: error: 'strstr' was not declared in this scope