A year ago I was experimenting with a minor change to Gkrellm system status app. I could make changes, compile, and run the app to see the results. I had dropped the effort until recently and when compiling the app, I now receive this:
make[1]: Entering directory '/home/jmoe/diy/gkrellm-2.3.10/src'
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found
Further investigation indicates that the whole pkg-config infrastructure has been removed. There are no *.pc files to be found anywhere.