The README.md describes a file called PicPas-linux, but I could not find that in your github repository.
The linux executable is "PicPas-linux". It's just I work more in Windows, so not always I build a Linux version. But you can find the executable in previous versions, in the same GitHub.
Compiling from source gives this error:
FormPrincipal.pas(11,3) Fatal: Cannot find SynFacilHighlighter used by FormPrincipal of the Project Inspector.
Are there dependencies for source compilation?
Yes. To compile you need to download all the Third Party libraries:
..\..\_Librerias\SynFacilUtils-1.21;
..\..\_Librerias\MisUtils 0.5;
..\..\_Librerias\MiConfig 0.4b;
..\..\_Librerias\PicUtils-1.2;
..\..\_Librerias\Xpres-1.3.2;
..\..\_Librerias\UtilsGrilla 0.8;
..\..\_Librerias\ogEditGraf 1.6b
All are mine so you can find them in my GitHub.