Hi @saijanani.tx ,
I have same problem with gtkmm:
$ pkg-config --libs --cflags gtkmm-3.0
Package gl was not found in the pkg-config search path.
Perhaps you should add the directory containing `gl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gl', required by 'epoxy', not found
Are you found the solution?
Best regards,
Attila