compile error with Assert()

I am getting the following error from the current tree.  This is with
Assert checking turned on.

---------------------------------------------------------------------------

gcc2 -O2 -m486 -pipe -g -Wall -I../../../include -I../../../backend   -I/u/readline   -I../..    -c nbtsearch.c -o
nbtsearch.o
nbtsearch.c: In function `_bt_skeycmp':
nbtsearch.c:320: `NullValueRegProcedure' undeclared (first use this function)
nbtsearch.c:320: (Each undeclared identifier is reported only once
nbtsearch.c:320: for each function it appears in.)
nbtsearch.c: In function `_bt_compare':
nbtsearch.c:668: `NullValueRegProcedure' undeclared (first use this function)
gmake[3]: *** [nbtsearch.o] Error 1
gmake[3]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend/access/nbtree'
gmake[2]: *** [submake] Error 2
gmake[2]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend/access'
gmake[1]: *** [access.dir] Error 2
gmake[1]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend'
gmake: *** [all] Error 2

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