error compiling odbc support for 6.5.1 under OpenBSD

Okay

    Thanks to Louis Bertrand there is now a port of 6.5.1 to OpenBSD,
however in his default configuration he did not configure in odbc support.
Okay, I thought I would.  I installed the "Free iODBC driver manager", then
reran configure, then make...

everything compiles fine, then voila

gmake[2]: Entering directory
`/usr/ports/databases/postgresql/work/postgresql-6.
5.1/src/interfaces/odbc'
cc -I../../include -I../../backend   -I/usr/local/include -O2 -pipe -I.
-DHAVE_C
ONFIG_H -fpic -DPIC   -c info.c -o info.o
In file included from /usr/local/include/sql.h:37,
                 from /usr/local/include/isql.h:32,
                 from isqlext.h:8,
                 from info.c:30:
/usr/local/include/sqltypes.h:58: warning: `SQL_API' redefined
isql.h:24: warning: this is the location of the previous definition
In file included from /usr/local/include/sql.h:37,
                 from /usr/local/include/isql.h:32,
                 from isqlext.h:8,
                 from info.c:30:
/usr/local/include/sqltypes.h:65: redefinition of `UCHAR'
isql.h:7: `UCHAR' previously declared here
/usr/local/include/sqltypes.h:69: redefinition of `UDWORD'
isql.h:10: `UDWORD' previously declared here
/usr/local/include/sqltypes.h:70: redefinition of `SDWORD'
isql.h:8: `SDWORD' previously declared here
/usr/local/include/sqltypes.h:71: redefinition of `UWORD'
isql.h:11: `UWORD' previously declared here
/usr/local/include/sqltypes.h:72: redefinition of `SWORD'
isql.h:9: `SWORD' previously declared here
/usr/local/include/sqltypes.h:75: redefinition of `SFLOAT'
psqlodbc.h:25: `SFLOAT' previously declared here
/usr/local/include/sqltypes.h:76: redefinition of `SDOUBLE'
psqlodbc.h:26: `SDOUBLE' previously declared here
/usr/local/include/sqltypes.h:94: redefinition of `PTR'
isql.h:13: `PTR' previously declared here
/usr/local/include/sqltypes.h:107: redefinition of `HENV'
isql.h:15: `HENV' previously declared here
/usr/local/include/sqltypes.h:108: redefinition of `HDBC'
isql.h:16: `HDBC' previously declared here
/usr/local/include/sqltypes.h:109: redefinition of `HSTMT'
isql.h:17: `HSTMT' previously declared here
/usr/local/include/sqltypes.h:122: redefinition of `HWND'
iodbc.h:30: `HWND' previously declared here
/usr/local/include/sqltypes.h:130: redefinition of `RETCODE'
isql.h:19: `RETCODE' previously declared here
In file included from info.c:30:
isqlext.h:348: redefinition of `SQLCHAR'
/usr/local/include/sqltypes.h:83: `SQLCHAR' previously declared here
isqlext.h:349: redefinition of `SQLSMALLINT'
/usr/local/include/sqltypes.h:85: `SQLSMALLINT' previously declared here
isqlext.h:350: redefinition of `SQLUSMALLINT'
/usr/local/include/sqltypes.h:86: `SQLUSMALLINT' previously declared here
isqlext.h:351: redefinition of `SQLINTEGER'
/usr/local/include/sqltypes.h:87: `SQLINTEGER' previously declared here
isqlext.h:352: redefinition of `SQLUINTEGER'
/usr/local/include/sqltypes.h:88: `SQLUINTEGER' previously declared here
isqlext.h:356: redefinition of `SQLSCHAR'
/usr/local/include/sqltypes.h:84: `SQLSCHAR' previously declared here
isqlext.h:357: redefinition of `BOOKMARK'
/usr/local/include/sqltypes.h:137: `BOOKMARK' previously declared here
isqlext.h:379: redefinition of `struct tagDATE_STRUCT'
isqlext.h:383: redefinition of `DATE_STRUCT'
/usr/local/include/sqltypes.h:146: `DATE_STRUCT' previously declared here
isqlext.h:385: redefinition of `struct tagTIME_STRUCT'
isqlext.h:389: redefinition of `TIME_STRUCT'
/usr/local/include/sqltypes.h:155: `TIME_STRUCT' previously declared here
isqlext.h:391: redefinition of `struct tagTIMESTAMP_STRUCT'
isqlext.h:399: redefinition of `TIMESTAMP_STRUCT'
/usr/local/include/sqltypes.h:168: `TIMESTAMP_STRUCT' previously declared
here
gmake[2]: *** [info.o] Error 1
gmake[2]: Leaving directory
`/usr/ports/databases/postgresql/work/postgresql-6.5
.1/src/interfaces/odbc'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory
`/usr/ports/databases/postgresql/work/postgresql-6.5
.1/src/interfaces'
gmake: *** [all] Error 2
*** Error code 2

Stop in /usr/ports/databases/postgresql.
*** Error code 1

Stop in /usr/ports/databases/postgresql.
*** Error code 1

Stop in /usr/ports/databases/postgresql.