G'MIC plug-in with high-bit depth support

Software G'MIC
5

I’m having problems.

I’ve got Gimp 2.9.1 installed okay. And I got as far as “make gimp” then i get this message on Ubuntu 14.04

Package json-glib-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `json-glib-1.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'json-glib-1.0', required by 'GEGL', not found
No output from 'pkg-config --cflags gimpui-2.0'
Package json-glib-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `json-glib-1.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'json-glib-1.0', required by 'GEGL', not found
No output from 'pkg-config --libs gimpui-2.0'
gmic_gimp.cpp:52:21: fatal error: gtk/gtk.h: No such file or directory
 #include <gtk/gtk.h>
                     ^
compilation terminated.
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