nanogui: Thread: error on compiling flnx-0.16

Hi, 
I am trying to compile flnx-0.16 in order to make the Viewml work on
microwindows, However this error I just couldn't resolve:
fl_draw_pixmap.cxx:233:parse error before ';'
fl_draw_pixmap.cxx:234:implicit declaration of function 'int
XParseColor(...)'
fl_draw_pixmap.cxx:235:request for member 'red' in 'x', which is of
non-aggregate type 'int'

do you know where went wrong??
can you help me out here?

thank you 

Victor