building adminserver, "./configure --help" indicates,

	../configure --help | egrep "with-httpd|with-apxs|with-apr-config"
	  --with-httpd=PATH       Full path of Apache binary. Configure will usually
	  --with-apxs=PATH        Path to apxs
	  --with-apr-config       Use apr-config to determine the APR directory

although it's clear that 

	--with-httpd=...
	--with-apxs=...

accept full path to binary, for,

	--with-apr-config

it's not.

but, apparently, it does/can accept,

	--with-apr-config=/path/to/apr-config


"./configure --help" section should be corrected/clarified.