HP UX 11.31 Variable OS_VERSION is recursive

[Branislav Masar <brano.masar%gmail.com@localhost>]

ello guys,

I have tried to use both pkgsrc-2010Q4 and latest stable branch. In
latest stable branch I wasn't able to see clear error as it was
printing below message and kept creating new shells indefinitely.

bmake: Unknown modifier 'C'
bmake: Unknown modifier '/'
bmake: Unknown modifier 'C'

With pkgsrc-2010Q4 I was able to replicate the issue as below

[cpd04994 - /home/cpd04994/pkgsrc/pkgtools/bootstrap-mk-files]cd
/home/cpd04994/pkgsrc/pkgtools/bootstrap-mk-files &&
/home/cpd04994/pkgsrc/bootstrap/work/bin/bmake -DPKG_PRESERVE
MAKECONF=/home/cpd04994/pkgsrc/bootstrap/work/mk.conf install
bmake: Unknown modifier 'C'
bmake: Unknown modifier '/'
bmake: Unknown modifier 'C'
Variable OS_VERSION is recursive.

bmake: stopped in /home/cpd04994/pkgsrc/pkgtools/bootstrap-mk-files
${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'

System info: HP-UX c1509m00 B.11.31 U ia64 4091922083 unlimited-user license

Is there a way to circumvent this error?