PRICE is released under GPL v2, since GNUstep transitioned to the GNU Lesser Public License version 3 or greater, a special exception for using against GNUstep is provided.
As a special exception, the copyright holders of PRICE give you permission to combine PRICE program with free software programs or libraries that are released under the GNU Lesser Public License version 3 or greater and with independent modules that communicate with PRICE solely through the PRICE interface. You may copy and distribute such a system following the terms of the GNU GPLv2 for PRICE and the licenses of the other code concerned, provided that you include the source code.