apache 2.4 envvars ? Deb 9.4

[Dave]

when i run apache2, i get an error APACHE_PID_FILE missspelled or 
unknown var.

and how do i include the "envvars" in the apache2.conf file ?
if i remove this varible i get no error but, i get errors when i try to 
install php saying missing "envvars /var/run/apache2/pid.pid"

the envvars file only has 1 active line

APACHE_PID_FILE /var/run/apapche2.pid


please advise.