fail to success command line 'make'

[Azaretdodo]

hello,

fail to success command line 'make' like copy paste following :

g++    -c -o knn.o knn.cpp
knn.cpp: In function ‘KNNModel* LoadKNNModel(std::ifstream&)’:
knn.cpp:252:14: error: ‘strcmp’ is not a member of ‘std’
  252 |     if (std::strcmp(cmd, "num_examples") == 0) {
      |              ^~~~~~
knn.cpp:255:14: error: ‘strcmp’ is not a member of ‘std’
  255 |     if (std::strcmp(cmd, "num_classes") == 0) {
      |              ^~~~~~
knn.cpp:258:14: error: ‘strcmp’ is not a member of ‘std’
  258 |     if (std::strcmp(cmd, "num_neighbors") == 0) {
      |              ^~~~~~
knn.cpp:261:14: error: ‘strcmp’ is not a member of ‘std’
  261 |     if (std::strcmp(cmd, "labels") == 0) {
      |              ^~~~~~
knn.cpp:268:14: error: ‘strcmp’ is not a member of ‘std’
  268 |     if (std::strcmp(cmd, "dist_neighbors") == 0) {
      |              ^~~~~~
knn.cpp:279:14: error: ‘strcmp’ is not a member of ‘std’
  279 |     if (std::strcmp(cmd, "label_neighbors") == 0) {
      |              ^~~~~~
knn.cpp:290:14: error: ‘strcmp’ is not a member of ‘std’
  290 |     if (std::strcmp(cmd, "min_same") == 0) {
      |              ^~~~~~
knn.cpp:301:14: error: ‘strcmp’ is not a member of ‘std’
  301 |     if (std::strcmp(cmd, "min_diff") == 0) {
      |              ^~~~~~
make: *** [<commande interne> : knn.o] Erreur 1

Thank you in advance to help myself fully installed your program,

Regards.

Azaretdodo.