portupgrade complains "Makefile possibly broken: lang/php5"

[Yuri]

I am having the following problem while updating he ports:

# /usr/local/sbin/portupgrade -aP

** Makefile possibly broken: lang/php5:
        apxs:Error: /usr/local/bin/apr-1-config not found!.
        "/usr/ports/Mk/bsd.apache.mk", line 287: warning: 
"/usr/local/sbin/apxs -q MPM_NAME" returned non-zero status
        php5-5.2.6


/usr/local/sbin/portupgrade:1433:in `get_pkgname': Makefile broken 
(MakefileBrokenError)
        from /usr/local/sbin/portupgrade:622:in `main'
        from /usr/local/sbin/portupgrade:613:in `each'
        from /usr/local/sbin/portupgrade:613:in `main'
        from /usr/local/sbin/portupgrade:588:in `catch'
        from /usr/local/sbin/portupgrade:588:in `main'
        from /usr/local/lib/ruby/1.8/optparse.rb:1303:in `call'
        from /usr/local/lib/ruby/1.8/optparse.rb:1303:in `parse_in_order'
        from /usr/local/lib/ruby/1.8/optparse.rb:1299:in `catch'
         ... 6 levels...
        from /usr/local/lib/ruby/1.8/optparse.rb:785:in `initialize'
        from /usr/local/sbin/portupgrade:229:in `new'
        from /usr/local/sbin/portupgrade:229:in `main'
        from /usr/local/sbin/portupgrade:2173


Thanks,
Yuri