Compiling flnx-0.16

Hi everyone.

I am trying to compile flnx-0.16 in order to use ViewML. I have already
installed and tested microwindows, and solved some problems related to the
compilation of flnx-0.16 simply by reading some posts in this mailing list.
But now I get the following errors:

/usr/lib/libmwdrivers.a(scr_x11.o): In function `lookup_color':
scr_x11.o(.text+0xc3): undefined reference to `XLookupColor'
scr_x11.o(.text+0xdc): undefined reference to `XAllocColor'
/usr/lib/libmwdrivers.a(scr_x11.o): In function `select_visual':
scr_x11.o(.text+0x222): undefined reference to `XDefaultVisual'

(a lot more undefined references...)

kbd_x11.o(.text+0x62a): undefined reference to `XChangePointerControl'
collect2: ld returned 1 exit status
make[1]: *** [fluid] Error 1
/usr/lib/libmwdrivers.a(scr_x11.o): In function `lookup_color':
scr_x11.o(.text+0xc3): undefined reference to `XLookupColor'
scr_x11.o(.text+0xdc): undefined reference to `XAllocColor'

(... and more undefined references yet)

kbd_x11.o(.text+0x62a): undefined reference to `XChangePointerControl'
collect2: ld returned 1 exit status
make[1]: *** [valuators] Error 1
make: *** [all] Error 2

Can anyone help me, please?

Thanks in advance.

David.