Creating custom widget linker error

[Rúben Rodrigues <ruben_gr live com pt>]

Hi,

I'm trying to create a custom widget like in this example: 
http://djcj.org/gtk/

The example works, but when i try to make something similar i get a 
linker error, and don't understand why!

Error:

make all
Building target: ConsolaGrafica
Invoking: Cross GCC Linker
arm-linux-gnueabihf-gcc -L/opt/x-tools/rootfs/rpi/usr/local/lib 
-L/lib/arm-linux-gnueabihf -L/opt/x-tools/rootfs/rpi/home/pi/jsmn 
-L/usr/lib/gcc-cross/arm-linux-gnueabi/5/ 
-L/opt/x-tools/rootfs/rpi/home/pi/linechart-dist/anychart 
-L/usr/lib/arm-linux-gnueabihf --sysroot=/opt/x-tools/rootfs/rpi 
`pkg-config --libs gmodule-export-2.0` 
/opt/x-tools/rootfs/rpi/usr/lib/arm-linux-gnueabihf/libstdc++.so.6 -o 
"ConsolaGrafica"  ./src/home/Home_Alarms.o ./src/home/Home_Cooling.o 
./src/home/Home_Houses.o ./src/home/Home_Sensors.o  
./src/gtk-linechart/gtk-linechart.o ./src/dialogs/Setup_Alarms.o 
./src/dialogs/Setup_Cooling_Reduction.o ./src/dialogs/Setup_Exits.o 
./src/dialogs/Setup_Heating.o ./src/dialogs/Setup_Lighting.o 
./src/dialogs/Setup_ProbeEnable.o ./src/dialogs/Setup_Progression.o 
./src/dialogs/Setup_Super_Coolers.o ./src/dialogs/Setup_Super_Cooling.o 
./src/dialogs/Setup_Super_ProbeCal.o ./src/dialogs/Setup_TimeDate.o 
./src/dialogs/Setup_Weight.o ./src/dialogs/ask_passcode.o  
./src/customwidgets/circulargauge.o 
./src/customwidgets/circularprogressbar.o ./src/customwidgets/gtkmeter.o 
./src/customwidgets/mycpu.o ./src/customwidgets/psquare.o 
./src/customwidgets/stroker-nodalcontainer.o  ./src/Database.o 
./src/EditableTable.o ./src/Keypad.o ./src/LogView.o ./src/Main.o 
./src/SaveConfig.o ./src/StatusBar.o ./src/UpdateConfig.o 
./src/UpdateStatus.o ./src/callbacks.o   -lgtk-3 -lX11 -lcurl -lgdk-3 
-lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo 
-lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lgmodule-2.0 
-lpthread -lmysqlclient -lz -ldl -lm -lpangoft2-1.0 -lfontconfig 
-lfreetype -lgthread-2.0 -lanychart -lstdc++ -ljsmn
./src/customwidgets/circularprogressbar.o: In function 
`circular_progressbar_set_property':
/home/autofran_ruben/dev/consola/ConsolaGrafica/RaspberryPiDebug/../src/customwidgets/circularprogressbar.c:145:
 
undefined reference to `circular_progress_bar_get_type'


Definition (.h file):

GType          circular_progress_bar_get_type (void) G_GNUC_CONST;

#define GTK_CIRCULAR_PROGRESSBAR_TYPE (circular_progress_bar_get_type ())
#define GTK_CIRCULAR_PROGRESSBAR(obj) (G_TYPE_CHECK_INSTANCE_CAST 
((obj), GTK_CIRCULAR_PROGRESSBAR_TYPE, CircularProgressBar))
#define GTK_CIRCULAR_PROGRESSBAR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST 
((klass), GTK_CIRCULAR_PROGRESSBAR_TYPE, CircularProgressBarClass))
#define GTK_CIRCULAR_IS_PROGRESSBAR(obj) (G_TYPE_CHECK_INSTANCE_TYPE 
((obj), GTK_CIRCULAR_PROGRESSBAR_TYPE))
#define GTK_CIRCULAR_IS_PROGRESSBAR_CLASS(klass) 
(G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_CIRCULAR_PROGRESSBAR_TYPE))
#define GTK_CIRCULAR_PROGRESSBAR_GET_CLASS(obj) 
(G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_CIRCULAR_PROGRESSBAR_TYPE, 
CircularProgressBarClass))

Thanks


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