diff --git a/Makefile b/Makefile
index 8b37ee4..6d358ca 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,20 @@
 CC := gcc
 CCFLAGS := -pedantic -std=c99
+LDFLAGS := -lm
 OBJ := main.o
 TARGET := main
 
 all: main use
 
 main: $(OBJ)
-	$(CC) $(CCFLAGS) $(OBJ) -o $(TARGET)
+	$(CC) $(CCFLAGS) $(OBJ) -o $(TARGET) $(LDFLAGS)
 	./main
 
 $(OBJ): main.c
 	$(CC) $(CCFLAGS) -c main.c -o $(OBJ)
 
 use: use.o
-	$(CC) $(CCFLAGS) use.o -o use
+	$(CC) $(CCFLAGS) use.o -o use $(LDFLAGS)
 
 use.o: use.c
 	$(CC) $(CCFLAGS) -c use.c -o use.o
diff --git a/main.c b/main.c
index b198bc1..1086e09 100644
--- a/main.c
+++ b/main.c
@@ -79,7 +79,7 @@ int main(){
   double trainingInputs[NUM_TRAINING_SETS][NUM_INPUTS] = {{0.0f, 0.0f}, {1.0f, 0.0f},
                                                           {0.0f, 1.0f}, {1.0f, 1.0f}};
 
-  double trainingOutputs[NUM_TRAINING_SETS][NUM_OUTPUTS] = {{0.0f}, {1.0f}, {1.0f}, {0.0f}};
+  double trainingOutputs[NUM_TRAINING_SETS][NUM_OUTPUTS] = {{1.0f}, {0.0f}, {0.0f}, {1.0f}};
 
   for(int i = 0; i < NUM_INPUTS; i++){
     for(int j = 0; j < NUM_HIDDEN; j++){
diff --git a/main.h b/main.h
index 8088753..0550e09 100644
--- a/main.h
+++ b/main.h
@@ -4,7 +4,6 @@
 
 #ifndef MAIN_H
 #define MAIN_H
-#include <sys/_types/_size_t.h>
 #include <math.h>
 #include <stdlib.h>