extension building

[Anon]

I try to build php extension but I receive errors during make. In extension directory (../ext/oci8) I type:

phpize;
./configure
make

Make exits with following errors:
oci8.c:51: php.h: no such file or directory
oci8.c:53: ext/standard/head.h: no such file or directory
oci8.c:54: ext/standard/info. no such file or directory
make[1]:***[oci8.slo] Error 1
make[1]: Leaving directory '/home/vlad/downloads/php-4.0.4pl1/ext/oci8'
make:***[all recursive] Error 1

Please help!