gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.

octopus-10.1 prints these messages:

checking for gdlib-config... /usr/local/bin/gdlib-config
gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.
gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.
gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.
gdlib-config: warning: this script is deprecated; please use the pkg-config file instead.