Any way to get the src of PHP?

[markkimsal]

I'm trying to compile an extension, that itself needs the source of the GD extension. Is the PHP source installed somewhere and I just need to adjust include flags?

/home/runner/work/numpower/numpower/src/ndarray.c:27:10: fatal error: ext/gd/libgd/gd.h: No such file or directory
   27 | #include "ext/gd/libgd/gd.h"
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.