When was a Function Added?

When was the ECPG function PGTYPEStimestamp_add_interval added to ECPG? My school has a server for student
assignmentsand demonstrations with SunOS 5.9, PostgreSQL 7.4.8, ECPG 3.1.1, and GCC 3.4.6. In the documentation linked
below,I can see that 
that function goes back as far as PostgreSQL 8.2. Is it in version 7.4.8?

    When I try to compile (with gcc -o roomboss -g -I /usr/local/pgsql/include/ roomboss.c -lecpg -lpq -lpgtypes), GCC
saysPGTYPEStimestamp_add_interval is an undefined symbol, and has a symbol referencing error. On my own machine, where
Ihave 
current versions of everything, I can compile fine.

    I may ask the server administrator if he can upgrade PostgreSQL or ECPG. Where can I find out what that might
break?Would it not be backwards compatible with some programs written to compile under the older version of PostgreSQL
andECPG? 

Here is documentation on the function:
http://www.google.com/search?q=site:www.postgresql.org+PGTYPEStimestamp_add_interval&hl=en&safe=off&filter=0

     ~ Paul Nickerson