Comment 23 for bug 792115

@Alex - After you recent updates, building on Windows returns the following errors (no problem on Ubuntu):

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Make error line 303: problem compiling: cc1.exe: warning: command line option "-Woverloaded-virtual" is valid for C++/ObjC++ but not for C
src/libgdl/test-combo-button.c:26:30: error: gdl-combo-button.h: No such file or directory
src/libgdl/test-combo-button.c:29: error: expected ')' before '*' token
src/libgdl/test-combo-button.c: In function 'main':
src/libgdl/test-combo-button.c:63: warning: implicit declaration of function 'gdl_combo_button_new'
src/libgdl/test-combo-button.c:63: warning: assignment makes pointer from integer without a cast
src/libgdl/test-combo-button.c:64: warning: implicit declaration of function 'gdl_combo_button_set_label'
src/libgdl/test-combo-button.c:64: warning: implicit declaration of function 'GDL_COMBO_BUTTON'
src/libgdl/test-combo-button.c:65: warning: implicit declaration of function 'gdl_combo_button_set_menu'
src/libgdl/test-combo-button.c:68: warning: implicit declaration of function 'gdl_combo_button_set_icon'
src/libgdl/test-combo-button.c:71: error: 'combo_button_activate_default_cb' undeclared (first use in this function)
src/libgdl/test-combo-button.c:71: error: (Each undeclared identifier is reported only once
src/libgdl/test-combo-button.c:71: error: for each function it appears in.)
src/libgdl/test-combo-button.c:85: warning: assignment makes pointer from integer without a cast
src/libgdl/test-combo-button.c:98: warning: assignment makes pointer from integer without a cast
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Would you be willing to take a look? Thanks.