cannot compile pygtk 2.24.0 aginst pygobject 2.90.4

[jls]

checking for PYGOBJECT... no
configure: error: Package requirements (pygobject-2.0 >= 2.21.3) were not met:

No package 'pygobject-2.0' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables PYGOBJECT_CFLAGS
and PYGOBJECT_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

[Arslan S.]

it is probably that pygobject 2.90.4 is actually pygobject-3.0 also 2.90.4 is a beta version

most of the gnome projects obey some versioning rules, a few notes from my experince with gnome:
any major version ending with odd numbers are development branch and even numbers are stable for example pygobject 2.27 is dev branch but 2.26 is stable
when 2.27 is going to be released as 2.28 they start numbering it like 2.27.90.x which they call beta releases and anything like 2.27.97, 2.27.98 or even 2.27.999 is called release candidate

so you must stick with 2.28 stable branch till tc moves to gtk3