Gtk-WARNING **: cannot open display:
An error, "Gtk-WARNING **: cannot open display:" was observed while running a C program with GTK+ under Cygwin.
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September 22, 2018
An error, "Gtk-WARNING **: cannot open display:" was observed while running a C program with GTK+ under Cygwin.
Resolution of error, cygwin1.dll not found, observed while running a C program compiled under Cygwin and running directly under Windows.