Removed the extra #cgo directives from the Unix files. cgo collects directives from ALL files, rather than using each file's directive individually, so having them combined like this is pointless. Instead, the #cgo directives are (or is, since there's only one) in uitask_unix.go. Will do the same for Mac next; this will help since we're going to add a CFLAGS value afterward.

area_unix.go

@@ -10,7 +10,6 @@ import (
 	"image"
 )
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 // extern gboolean our_area_draw_callback(GtkWidget *, cairo_t *, gpointer);
 // extern gboolean our_area_button_press_event_callback(GtkWidget *, GdkEvent *, gpointer);

callbacks_unix.go

@@ -14,7 +14,6 @@ cgo doesn't support calling Go functions by default; we have to mark them for ex
 while we're at it the callback for our idle function will be handled here too
 */
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 // extern gboolean our_window_delete_event_callback(GtkWidget *, GdkEvent *, gpointer);
 // extern gboolean our_window_configure_event_callback(GtkWidget *, GdkEvent *, gpointer);

dialog_unix.go

@@ -8,7 +8,6 @@ import (
 	"unsafe"
 )
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 // /* because cgo seems to choke on ... */
 // /* TODO does NULL parent make the box application-global? docs are unclear */

gtkcalls_unix.go

@@ -10,7 +10,6 @@ import (
 	"unsafe"
 )
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 import "C"
 

gtkcasts_unix.go

@@ -13,7 +13,6 @@ import (
 // toxxxx() converts from Go type to GTK+ type
 // Listbox casts are stored in listbox_unix.go
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 import "C"
 

listbox_unix.go

@@ -29,7 +29,6 @@ For more information, read
 and the GTK+ reference documentation.
 */
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 // /* because cgo seems to choke on ... */
 // void gtkTreeModelGet(GtkTreeModel *model, GtkTreeIter *iter, gchar **gs)

sysdata_unix.go

@@ -8,7 +8,6 @@ import (
 	"time"
 )
 
-// #cgo pkg-config: gtk+-3.0
 // #include "gtk_unix.h"
 import "C"