OK, this version works for the compressed data node approach.
Checking for errors and freeing the malloc'd buffer is left as an
exercise for the reader...

=========== test3.fl ==============
# data file for the Fltk User Interface Designer (fluid)
version 1.0400
header_name {.h}
code_name {.cxx}
decl {\#include <FL/Fl_SVG_Image.H>} {public global
}

decl {\#include <FL/Fl_Box.H>} {public global
}

decl {\#include <stdlib.h>} {private local
}

decl {\#include <zlib.h>} {private local
}

data svg3 {private local filename {Scrub.svg} compressed
}

class svg_rsz {open : {public Fl_Box}
} {
  Function {svg_rsz(Fl_SVG_Image *svg2, int X, int Y, int W, int H,
const char* L=0) : Fl_Box(X,Y,W,H,L)} {
    comment Constructor open
  } {
    code {svg = svg2;
svg->resize(w(),h());
image(svg);} {}
  }
  Function {resize(int x, int y, int w, int h)} {
    comment {A resize method} open return_type void
  } {
    code {Fl_Box::resize(x,y,w,h);
svg->resize(this->w(),this->h());} {}
  }
  decl {Fl_SVG_Image *svg;} {private local
  }
}

Function {} {open
} {
  code {unsigned char *svg3U = (unsigned char *)::malloc(svg3_size);
fltk_z_uLongf u_sz = (fltk_z_uLongf)svg3_size;
if (uncompress(svg3U, &u_sz, svg3, sizeof(svg3)) != Z_OK)
{
  /* error */
}} {}
  code {Fl_SVG_Image *svg2 = new Fl_SVG_Image(NULL, (char *)svg3U);} {selected
  }
  code {svg_rsz *boxA = NULL;} {}
  Fl_Window main_win {open
    private xywh {882 285 249 221} type Double resizable
    code0 {boxA = new svg_rsz(svg2, 15, 15, 180, 180);} visible
  } {}
}

===============================

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