make: /usr/ports/Mk/bsd.port.mk line 1638: warning: Couldn't read shell's output for if /sbin/sysctl -n compat.ia32.maxvmem >/dev/null 2>&1; then echo YES; fi

[Anton Shterenlikht]

On ia64 r252055 with ports at r321471
make issues lots of warnings like:

# make -C /usr/ports/ fetchindex
make: "/usr/ports/Mk/bsd.port.subdir.mk" line 101: warning: Couldn't read shell's output for "if /sbin/sysctl -n compat.ia32.maxvmem >/dev/null 2>&1; then echo YES; fi"
make: "/usr/ports/Mk/bsd.port.mk" line 1638: warning: Couldn't read shell's output for "if /sbin/sysctl -n compat.ia32.maxvmem >/dev/null 2>&1; then echo YES; fi"

*and many more idencal ones*

/usr/ports/INDEX-10.bz2                       100% of 1702 kB  458 kBps 00m04s
#

or

/usr/ports/devel/robodoc
# make -C /usr/ports/devel/robodoc showconfig
make: "/usr/ports/Mk/bsd.port.mk" line 1638: warning: Couldn't read shell's output for "if /sbin/sysctl -n compat.ia32.maxvmem >/dev/null 2>&1; then echo YES; fi"
===> The following configuration options are available for robodoc-4.99.41:
     DOCS=on: Build and/or install documentation
     EXAMPLES=on: Build and/or install examples
===> Use 'make config' to modify these settings
#

I updated OS from r249xxx, where this warning
didn't appear.

Please advise

Thanks

Anton