custom kernel install warnings

[rank1seeker at gmail.com]

FreeBSD 10.1-RELEASE-p9 i386
After build of custom kernel, during it's install I get:
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make[4]: "/usr/src/sys/modules/dpt/Makefile" line 26: warning: Couldn't read shell's output for "sed -n '/DEV_EISA/p' /usr/obj/usr/src/sys/SERVER/opt_eisa.h"

make[4]: "/usr/src/sys/modules/nfscl/Makefile" line 46: warning: Couldn't read shell's output for "cat /usr/obj/usr/src/sys/SERVER/opt_nfsroot.h"

make[4]: "/usr/src/sys/modules/nfsclient/Makefile" line 32: warning: Couldn't read shell's output for "cat /usr/obj/usr/src/sys/SERVER/opt_nfsroot.h"
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Errors are non fatal. Kernel installs and works.


Domagoj