php: symbol lookup error: /usr/lib/php5/20060613+lfs/apm.so: undefined symbol: php_json_encode

[proofek]

Hiya guys,

I've been trying to set up apm today and I got until a point when I
get this error. It's triggered when I call apm_get_sqlite_events and
want it to return data in json format, not html.

PHP version: 5.2.6

I am able to use json_encode from within php itself. I am guessing I
am missing a header file or something...

Regards
Sebastian Marek