error starting apache after php-compile (undefined symbol: pg_encoding_to_char)

Hi, I just compiled apache 1.3.26 , postgres 7.2.1 and then php 4.2.2 There haven´t been any error messages during the build, but when I want to start apache I get: "Cannot load /usr/local/apache_2/libexec/libphp4.so into server: /usr/local/apache_2/libexec/libphp4.so: undefined symbol: pg_encoding_to_char" My configure options for php were: "./configure --with-apxs=/usr/local/apache_2/bin/apxs --with-config-file-path=/etc/apache_2/conf/ --with-mysql=/usr/ --with-pgsql=/usr/local/pgsql" I did have a postgres 7.1.3 from rpms on my system before (read somewhere that this might be an issue) but it was installed in another path. Does anybody have a clue on how I can get rid of this problem? Many Thanks in advance! Patrick