gp file not found

Hello, I have installed gp using: make prefix=$PASCAL/local CFLAGS=-I/usr/include/i386-linux-gnu install and adding $PASCAL/local/bin to PATH gp --version reports "GP version 0.61" However gp x.pas results in "x.pas: file not found" At line 2643 in gp.pas the error message literal is "file not found". The ":" after the file name is must be from MainSrcBase If I place two source files on the command line the expected error occurs. I am using Q4OS linux and the source file is present when I do an "ls". What am I doing wrong? Thanks, Paul Isaacs