Fix build on Mac OS X El Capitan (10.11)

mkspecs/features/common_pre.prf

@@ -134,6 +134,7 @@ equals(WORD_SIZE,64): EXTERNALSDIR = $$EXTERNALSROOT/$$basename(QMAKESPEC)/lib64
 equals(WORD_SIZE,32): EXTERNALSDIR = $$EXTERNALSROOT/$$basename(QMAKESPEC)/lib32
 
 LIBS *= -L$$EXTERNALSDIR
+macx: LIBS *= -F$$EXTERNALSDIR
 win32: LIBS *= -luser32
 
 INCLUDEPATH *= $$EXTERNALDIR/common/include

src/blackinput/osx/keyboardmac.h

@@ -14,16 +14,9 @@
 
 #include "blackinput/keyboard.h"
 #include "blackmisc/input/hotkeycombination.h"
+#include <ApplicationServices/ApplicationServices.h>
 #include <QHash>
 
-class __CGEvent;
-
-typedef __CGEvent* CGEventRef; //!< Mac event definition
-typedef unsigned int CGEventType; //!< Max event type definition
-
-class __CGEventTapProxy;
-typedef __CGEventTapProxy* CGEventTapProxy; //!< Max event proxy definition
-
 namespace BlackInput
 {
     //! Mac OSX implemenation of IKeyboard using hook procedure

src/blackinput/osx/keyboardmac.mm

@@ -11,7 +11,6 @@
 #include <QHash>
 #include <QtWidgets/QMessageBox>
 #include <CoreFoundation/CoreFoundation.h>
-#include <ApplicationServices/ApplicationServices.h>
 #include <AppKit/NSEvent.h>
 #include <AppKit/NSAlert.h>
 #include <Foundation/NSString.h>
@@ -110,7 +109,7 @@ namespace BlackInput
         CGEventMask eventMask = ((1 << kCGEventKeyDown) | (1 << kCGEventKeyUp) | (1 << kCGEventFlagsChanged));
 
         // try creating an event tap just for keypresses. if it fails, we need Universal Access.
-        CFMachPortRef eventTap = CGEventTapCreate(kCGHIDEventTap, kCGHeadInsertEventTap, 0,
+        CFMachPortRef eventTap = CGEventTapCreate(kCGHIDEventTap, kCGHeadInsertEventTap, kCGEventTapOptionDefault,
                                  eventMask, myCGEventCallback, this);
 
         CFRunLoopSourceRef source = CFMachPortCreateRunLoopSource(kCFAllocatorDefault,

src/blackmisc/math/mathutils.cpp

@@ -12,6 +12,7 @@
 #include <QTime>
 #include <algorithm>
 #include <cmath>
+#include <cstdlib>
 
 namespace BlackMisc
 {