Hi!,i am trying the compile of a example for the library directFB and other for library cairo. I have isntall the libraries directFB and Cairo.The first step: i create a new package type "src-make-prog".2: copy the example "hello world" in the new file "helloworld*.c"3: I modify the Makefile file and i add:CFLAGS = -g -Wall -O2 -MD `pkg-config --cflags directfb`LDFLAGS = -g -Wall -O2 `pkg-config --libs directfb`for cairo is the same but the flags are:CFLAGS = -g -Wall -O2 -MD `pkg-config --cflags cairo`LDFLAGS = -g -Wall -O2 `pkg-config --libs cairo`In both cases, the compiler say me:undefined reference to `DirectFBInit', etc...undefined reference to `cairo_image_surface_create',etc...Am I doing it the right way or I need something more to add?