raster-png.cxx: In function ‘ByteRaster* read_png_image(const char*)’:
raster-png.cxx:104:47: error: ‘memcpy’ was not declared in this scope
       memcpy(pixel, row_pointers[row], nbytes);
                                              ^

--- libgfx/src/raster-png.cxx
+++ libgfx/src/raster-png.cxx
@@ -16,6 +16,7 @@
 #ifdef HAVE_LIBPNG
 
 #include <png.h>
+#include <string.h> /* memcpy() */
 
 ByteRaster *read_png_image(const char *file_name)
 {