"make installcheck" fails in src/test/recovery

Up until quite recently, it worked to do "make installcheck" in
src/test/recovery, following the instructions in the README
file there:

NOTE: You must have given the --enable-tap-tests argument to configure.
Also, to use "make installcheck", you must have built and installed
contrib/test_decoding in addition to the core code.

Run
make check
or
make installcheck
You can use "make installcheck" if you previously did "make install".
In that case, the code in the installation tree is tested. With
"make check", a temporary installation tree is built from the current
sources and then tested.

Now, however, the 016_min_consistency.pl test is falling over,
with symptoms indicating that it expects to have the pageinspect
extension installed as well:

error running SQL: 'psql:<stdin>:2: ERROR: could not open extension control fil
e "/home/postgres/testversion/share/extension/pageinspect.control": No such file
or directory'
while running 'psql -XAtq -d port=64106 host=/tmp/KaoBFubKfw dbname='postgres' -
f - -v ON_ERROR_STOP=1' with sql '
CREATE EXTENSION pageinspect;
...

Is this extra dependency actually essential? I'm not really
happy about increasing the number of moving parts in this test.

regards, tom lane