run easyapache with all you need is step 1.
ensure iconv is installed is step 2. instructions posted by another user above.
nano or pico /home/cpapachebuild/buildapache/buildscript
go down near the bottom where you see the PHP configures. there's 4 of them. go to the end of each and add --with-iconv=/usr/local or =/usr depending where your install is.
save buildscript and cd /home/cpapachebuild/buildapache
./buildscript
let it run
