Modify gtk libs as gtk+-2.0

Makefile

@@ -26,9 +26,9 @@ CFLAGS        += -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 \
 endif
 
 GLIB_CFLAGS   =
-GTK3_CFLAGS   = $(shell $(PKG_CONFIG) --cflags gtk+-3.0)
+GTK2_CFLAGS   = $(shell $(PKG_CONFIG) --cflags gtk+-2.0)
 
-CFLAGS        += $(GLIB_CFLAGS) $(GTK3_CFLAGS)
+CFLAGS        += $(GLIB_CFLAGS) $(GTK2_CFLAGS)
 
 ifeq ($(ARCH), arm)
 INCLUDES      := \
@@ -37,9 +37,9 @@ INCLUDES      := \
 endif
 
 GLIB_LIBS     = -lglib-2.0
-GTK3_LIBS     = $(shell $(PKG_CONFIG) --libs gtk+-3.0)
+GTK2_LIBS     = $(shell $(PKG_CONFIG) --libs gtk+-2.0)
 
-LIBS          += $(GLIB_LIBS) $(GTK3_LIBS)
+LIBS          += $(GLIB_LIBS) $(GTK2_LIBS)
 
 # Objects
 objects       = main.o