Makefile error from 5.1 to -current

[Guido Falsi]

Hi! I'm installing a box for experimenting, installed 5.1-RELEASE from
CD on it. When I upgraded the sources to latest -current and after a
build failure tried to cvsup again using "make update" got the attached
output. I looked into tha makefile but could not get what is really
wrong(I'm new to -current, even if I have followed this list for some
time).

Perhaps the condition causing the error is not a problem on non 5.1
machines.

Thanks in advance!

-- 
Guido Falsi <mad at madpilot.net>
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"Makefile.inc1", line 744: warning: String comparison operator should be either == or !=
"Makefile.inc1", line 744: Malformed conditional ((!defined(NO_RESCUE) ||  defined(RELEASEDIR)) &&  (${TARGET_ARCH} != ${MACHINE_ARCH} || ${BOOTSTRAPPING} < 501101))
"Makefile.inc1", line 744: Missing dependency operator
"Makefile.inc1", line 746: if-less endif
"Makefile.inc1", line 746: Need an operator
make: fatal errors encountered -- cannot continue
*** Error code 1

Stop in /usr/src.