postgres.h missing?

I searched the archives, but could not find anything on this.

I installed postgres-7.1 to /var/pgsql on my system, and then
configured php with './configure ... -pgsql=/var/pgsql'. The compile
fails complaining that it cannot find postgres.h. If I look in
/var/pgsql/include, I indeed find no such file:

$ ls /var/pgsql/include
c.h ecpgtype.h libpgtcl.h os.h sql3types.h
config.h iodbc libpq postgres_ext.h sqlca.h
ecpgerrno.h lib libpq-fe.h postgres_fe.h
ecpglib.h libpgeasy.h libpq-int.h pqexpbuffer.h

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