Compile errors 5.1.6 --with-pgsql

[markh <mark@xxxxxxxxxxx>]

I am having trouble getting php-5.1.6 to compile with pgsql.

my configuration:
'./configure' \
'--with-mysql' \
'--with-apxs=/usr/local/apache/bin/apxs' \
'--with-gettext' \
'--with-curl' \
'--enable-safe-mode' \
'--with-openssl' \
'--with-pgsql=shared' \
'--with-xml=/usr/' \
'--with-zlib-dir=/usr/include/' \
'--with-imap' \
'--with-imap-ssl' \
'--with-kerberos' \
'--with-gd' \
'--with-jpeg-dir=/usr/lib' \
'--with-ttf' \
'--with-freetype-dir=/usr/lib' \
'--enable-gd-native-ttf' \
'--with-imagick' \
'--with-pspell' \

Make fails with the following:
(.. snipped to save space)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3012: error: 'PQERRORS_TERSE' 
undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3012: error: 
'PQERRORS_DEFAULT' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3012: error: 
'PQERRORS_VERBOSE' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c: In function 
'zif_pg_result_error_field':
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3668: error: 
'PG_DIAG_SEVERITY' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3668: error: 
'PG_DIAG_SQLSTATE' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3668: error: 
'PG_DIAG_MESSAGE_PRIMARY' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3669: error: 
'PG_DIAG_MESSAGE_DETAIL' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3669: error: 
'PG_DIAG_MESSAGE_HINT' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3676: error: 
'PG_DIAG_STATEMENT_POSITION' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3676: error: 'PG_DIAG_CONTEXT' 
undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3676: error: 
'PG_DIAG_SOURCE_FILE' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3677: error: 
'PG_DIAG_SOURCE_LINE' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:3677: error: 
'PG_DIAG_SOURCE_FUNCTION' undeclared (first use in this function)
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c: In function 'php_pgsql_convert':
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:5018: warning: pointer targets 
in passing argument 1 of 'PQescapeBytea' differ in signedness
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c: In function 
'php_pgsql_result2array':
/home/instsrc/php-5.1.6/ext/pgsql/pgsql.c:5596: warning: pointer targets 
in passing argument 3 of 'php_addslashes' differ in signedness
make: *** [ext/pgsql/pgsql.lo] Error 1

This is on a debian install, with Postgresql 7.4 intalled from packages, 
Apache 1.3.37 built from sources.

Am currently running php-5.0.4 with pgsql, which built just fine.  Any 
ideas?
--Mark