Problem??

[Gianluca Lamanna]

Sorry,
I have some problem intalling the ddd. The configure looks fine but with
make I have this msg (tail):
<skip>
DispValue.h:46:19: Xm/Xm.h: No such file or directory
In file included from ddd.C:196:
LabelH.h:50:19: Xm/Xm.h: No such file or directory
In file included from ddd.C:199:
SourceView.h:55:19: Xm/Xm.h: No such file or directory
In file included from SourceView.h:63,
                 from ddd.C:199:
TextPosA.h:39:19: Xm/Xm.h: No such file or directory
In file included from ddd.C:201:
TextSetS.h:36:19: Xm/Xm.h: No such file or directory
TextSetS.h:37:21: Xm/Text.h: No such file or directory
TextSetS.h:38:22: Xm/TextF.h: No such file or directory
In file included from ddd.C:253:
selection.h:36:19: Xm/Xm.h: No such file or directory
gmake[1]: *** [ddd.o] Error 1
gmake[1]: Leaving directory `/root/ddd-3.3.1/ddd'
gmake: *** [all-recursive] Error 1

Why???
(I have RedHat 7.1 on Dual Intel Pentium 3)
THX,
Best regards,
Gianluca