-current buildworld fails on amd64 (5.2.1)

[Mikhail Teterin]

Starting with an empty /usr/obj:

cc -DHAVE_CONFIG_H -DCOMPILE_ONLY  -I/usr/src/lib/libmagic 
-I/usr/src/lib/libmagic/../../contrib/file -o mkmagic 
/usr/src/lib/libmagic/../../contrib/file/apprentice.c 
/usr/src/lib/libmagic/../../contrib/file/funcs.c 
/usr/src/lib/libmagic/../../contrib/file/magic.c 
/usr/src/lib/libmagic/../../contrib/file/print.c
/usr/obj/usr/src/amd64/usr/bin/ld: cannot find -lc
*** Error code 1

[...]

Any clues? Thanks!

    -mi