problem of making php5

[Hamilton]

Hi,
    I make php5 under FreeBSD release 5.2. I update the ports-databases =
to reach the version 1.5 for firebird. All is ok, but when run "make =
install clean" in /usr/ports/lang/php5, the error messages show as =
follow:

=3D=3D=3D>   firebird-1.5 depends on executable: gmake - found
=3D=3D=3D>   firebird-1.5 depends on file: /usr/local/bin/autoconf - =
found
=3D=3D=3D>   firebird-1.5 depends on file: =
/usr/local/libexec/libtool13/libtool - found
=3D=3D=3D>   firebird-1.5 depends on executable: bison - found
=3D=3D=3D>  Configuring for firebird-1.5
cp: aclocal.m4: No such file or directory
*** Error code 1

Stop in /usr/ports/databases/firebird.

Please give me some advice.

Thanks

Hamilton