> pkg-config --exists 'gobject-introspection-1.0 >= 0.10.8' --print-errors
> Package gobject-introspection-1.0 was not found in the pkg-config search path.
> Perhaps you should add the directory containing `gobject-introspection-1.0.pc'
> to the PKG_CONFIG_PATH environment variable
As it said, it wasn't able to locate gobject's PC file.
I suggest to locate it on your system (find / -name '*.pc' ... ) and add its directory into PKG_CONFIG_PATH variable as suggested.
Bye
Laurent