strange failure: Unwrapping files-to-be-installed

[Aleksey Cheusov <cheusov%tut.by@localhost>]

Linux, pkg_install-20080313.

Can anybody explain the following failure?

   ===> Building for xtris-1.15nb2
   gcc -O2 -DINET6 -I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__  
-I/usr/pkg/include -Wl,-R/usr/pkg/lib -DXTRISPATH="\"/usr/pkg/bin\"" xtris.c -o 
xtris -L/usr/pkg/lib -lX11  
   gcc -O2 -DINET6 -I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__  xtserv.c -o 
xtserv  
   gcc -O2 -DINET6 -I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__  
-I/usr/pkg/include -c xtbot.c
   gcc -O2 -DINET6 -I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__  
-I/usr/pkg/include -c decide.c
   gcc -O2 -DINET6 -I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__  xtbot.o 
decide.o -o xtbot  
   => Unwrapping files-to-be-installed.
   *** Error code 1

   Stop.
   bmake: stopped in /srv/pkgsrc/games/xtris
   *** Error code 1

   Stop.
   bmake: stopped in /srv/pkgsrc/games/xtris

.work.log doesn't contain anything helpful
    ...
    <.> /tmp/obj_pkgsrc/games/xtris/work/.gcc/bin/gcc -O2 -DINET6 
-I/tmp/obj_pkgsrc/games/xtris/work/.buildlink/include 
-D__USE_FIXED_PROTOTYPES__ -c decide.c 
-L/tmp/obj_pkgsrc/games/xtris/work/.buildlink/lib 
    [*] /tmp/obj_pkgsrc/games/xtris/work/.wrapper/bin/gcc 
/tmp/obj_pkgsrc/games/xtris/work/.wrapper/bin/gcc -O2 -DINET6 
-I/usr/pkg/include -D__USE_FIXED_PROTOTYPES__ xtbot.o decide.o -o xtbot
    <.> /tmp/obj_pkgsrc/games/xtris/work/.gcc/bin/gcc -O2 -DINET6 
-I/tmp/obj_pkgsrc/games/xtris/work/.buildlink/include 
-D__USE_FIXED_PROTOTYPES__ xtbot.o decide.o -o xtbot 
-L/tmp/obj_pkgsrc/games/xtris/work/.buildlink/lib 
    [*] /tmp/obj_pkgsrc/games/xtris/work/.tools/bin/true 
    <.> true  
    [*] /tmp/obj_pkgsrc/games/xtris/work/.tools/bin/true 
    <.> true  

-- 
Best regards, Aleksey Cheusov.