www/gtkhtml38 does not build

[Jan Henrik Sylvester]

www/gtkhtml38 (which I got as a dependency for gnucash) does not build:

htmlengine-edit-clueflowstyle.c: In function 'undo_or_redo':
htmlengine-edit-clueflowstyle.c:177: error: 'G_GNUC_FUNCTION' undeclared 
(first use in this function)
htmlengine-edit-clueflowstyle.c:177: error: (Each undeclared identifier 
is reported only once
htmlengine-edit-clueflowstyle.c:177: error: for each function it appears 
in.)
htmlengine-edit-clueflowstyle.c: In function 'set_clueflow_style_in_region':
htmlengine-edit-clueflowstyle.c:282: error: 'G_GNUC_FUNCTION' undeclared 
(first use in this function)
gmake[2]: *** [htmlengine-edit-clueflowstyle.lo] Error 1
gmake[2]: Leaving directory 
`/usr/ports/www/gtkhtml38/work/gtkhtml-3.12.3/src'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/usr/ports/www/gtkhtml38/work/gtkhtml-3.12.3'
gmake: *** [all] Error 2
*** Error code 2

All other ports are up to date.

(Since the libsoup dependency was the only "real" thing that changed on 
the last gtkhtml38 commit: Now I have libsoup-2.2.105_2 and 
libsoup-2.4.0 installed.)

Does this fail for anyone else or is it local to my system?

Thanks,
Jan Henrik