make buildworld problem

[Yury V.Lukke]

after cvsup'ing src-all to RELENG_4 and trying to make buildworld I get 
the next error message:
/usr/src/gnu/usr.bin/groff/src/libs/libgroff/../../../../../../contrib/groff/src/libs/libgroff/cmap.cc:25: 
cmap.h: No such file or directory

and a lot of the same messages "No such file or directory" on file 
cmap.cc, with
mkdep: compile failed
*** Error code 1

at the end of  output

I noticed in buildworld's output just before first error 2 mkdep calls: 
first with parameters
mkdep -f .depend -a    -DHAVE_CONFIG_H 
-I/usr/src/gnu/usr.bin/groff/src/libs/libgroff/../../../../../../contrib/groff/src/include 
-I/usr/src/gnu/usr.bin/groff/src/libs/libgroff/../../../src/include 
-D__FBSDID=__RCSID

and second without any parameters.
missed header files are in /usr/src/contrib/groff/src/include, so my 
problem is definitly around mkdep parameters, but how to correct it?

/usr/src and /usr/obj were removed before make buildworld, and just the 
same happened with RELENG_4_8 sources...