make failed at "‘Gtk::EntryIconPosition’ has not been declared"

I'm trying to compile under Mint link and after having installed all dependencies (some from source and some from repository) the following happens:

xxy@mint-desktop:~/dt/GZ/lifeograph-0.5.6$ make
cd src && make all
make[1]: Entering directory `/home/xxy/Desktop/GZ/lifeograph-0.5.6/src'
if [ ! -d ../obj ]; then \
  mkdir ../obj; \
 fi; \
 if [ ! -d ../bin ]; then \
  mkdir ../bin; \
 fi
g++ -c main.cpp -Wall `pkg-config gtkmm-2.4 gconfmm-2.6 gtkspell-2.0 --cflags` -O2 -o ../obj/main.o
In file included from lifeograph.hpp:35,
                 from main.cpp:25:
dialogtageditor.hpp:77: error: ‘Gtk::EntryIconPosition’ has not been declared
In file included from lifeograph.hpp:37,
                 from main.cpp:25:
dialogexport.hpp:127: error: ‘Gtk::EntryIconPosition’ has not been declared
In file included from main.cpp:25:
lifeograph.hpp:244: error: ‘Gtk::EntryIconPosition’ has not been declared
make[1]: *** [../obj/main.o] Error 1
make[1]: Leaving directory `/home/michael/Desktop/GZ/lifeograph-0.5.6/src'
make: *** [all] Error 2