In the file "tmac/pdfpic.tmac" the request '.pso' is used with a variable. As this request is only valid in an unsafe mode (groff option '-U') it only may take a constant text.
An example: .\" execute with the option -U (unsafe) .ds commmand-example date \*[command-example] .pso \*[command-example] .\".pso date .ie t troff-mode:after a request .pso .el nroff-mode: after a request .pso -.- test-groff -U -b -ww -z <file> Result: troff:pso.groff:3: warning: macro 'command-example' not defined
