Found a strange bug in trying to unpack the sources of the last beta gpc-970624.tar.gz on plain MSDOS djgpp v2.01 with
djtar -x -v gpc-9706.tgz (8.3 limitation)
It barks: unable to create the directory gpc-970624/p/
If I create manually gpc-9706 before untarring it works.
In fact by comparing with the previous release (which worked directly), the list of contents produced with djtar -t ... I found that the only difference is that now all is in the subdirectory p/ It seems that what is missing is a first line in the tar file which creates the directory gpc-970624 itself: the first line tries to create the directory gpc-970624/p directly
I suppose that you have built the tar tree starting from gpc-970624/p and not from gpc-970624 itself This is supported also by the fact that the files COPYING.gpc and INSTALL.gpc which are said in the file gpc-970624/p/install to be within gpc-970624 together with the directory p are not there.
Hoping it will help