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Obviously we should check for a nullptr returned for window
object from builder.getObject(), before we call methods on it.
Signed-off-by: Carsten Schlote <schlote@vahanus.net>

Fix ApiLookup errors

for correct generation

* Fix incorrect generation for DateTime class

After GIR generation there is 2 the same constructors. It calls compilation errors and should be fixed

* Remove twice DateTime constructor declaration

It calls compilation errors and should be fixed

It calls compilation errors and should be fixed

After GIR generation there is 2 the same constructors. It calls compilation errors and should be fixed

* GNUmakefile: allow to set custom gir directory

Supports for other types like string and bool is still missing.

Fixes: #333

Fixes: #326

and add the needed import for ObjectG.

Fixes: #325

There is still an GTK error when editing a cell, not sure if it's caused by code in this demo.

See Also: #315

Still need to find a way to get rid of the size allocation warning.

Look like gtk_builder_real_get_type_from_name_override in the old D implementation of Builder is no longer needed.

Some may need an other solution than to simply remove them.

Specifying the directory to install .pc files is necessary on systems
where the pkg-config tool expects those files in a directory other
than $(libdir)/pkgconfig.