MKDIR_P@: Command not found error in regression test

Hi -
I installed postgres 9.2.2 from source successfully. I then made some minor
code changes to learn how to build postgres again. I am on Ubuntu linux
version 3.5.0-17.'./configure' and 'make' gave no errors, but while running
'make check', I get the following error:

make -C ../backend submake-errcodes
make[3]: Entering directory `/home/user/pgsql/pgsql/src/backend'
make[3]: Nothing to be done for `submake-errcodes'.
make[3]: Leaving directory `/home/user/pgsql/pgsql/src/backend'
make[2]: Leaving directory `/home/user/pgsql/pgsql/src/port'
rm -rf ./testtablespace
mkdir ./testtablespace
../../../src/test/regress/pg_regress --inputdir=.
--temp-install=./tmp_check --top-builddir=../../.. --dlpath=.
--schedule=./parallel_schedule
============== creating temporary installation ==============

pg_regress: installation failed
Examine /home/user/pgsql/pgsql/src/test/regress/log/install.log for the
reason.
Command was: "make" -C "../../.."
DESTDIR="/home/user/pgsql/pgsql/src/test/regress/./tmp_check/install"
install > "/home/user/pgsql/pgsql/src/test/regress/log/install.log" 2>&1
make[1]: *** [check] Error 2
make[1]: Leaving directory `/home/user/pgsql/pgsql/src/test/regress'
make: *** [check] Error 2

Checking the regress logs at 'src/test/regress/log/install.log', I see the
following messages at the bottom:

/bin/mkdir -p
'/home/user/pgsql/pgsql/src/test/regress/./tmp_check/install/usr/local/pgsql/lib/pgxs/src/test/regress'
/bin/sh ../../../config/install-sh -c pg_regress
'/home/user/pgsql/pgsql/src/test/regress/./tmp_check/install/usr/local/pgsql/lib/pgxs/src/test/regress/pg_regress'
make[2]: Leaving directory `/home/user/pgsql/pgsql/src/test/regress'
make[1]: MKDIR_P@: Command not found
make[1]: *** [installdirs-local] Error 127
make[1]: Leaving directory `/home/user/pgsql/pgsql/src'
make: *** [install-src-recurse] Error 2
make: Leaving directory `/home/user/pgsql/pgsql'

Any clues on what's wrong?? It's very unlikely that any of my code changes
are causing this.

Thanks
Karthik