Yes I read your post. Since you knew where to type a configure command and make etc I assumed make clean would be understood. Your error was not clear as this is what your wrote. Alot of times we need to guess at what a customer is saying as the error message they are posting is not clear at all.
A configure folder/file didn't exist type of error.
Obviously from your post I assumed you where in the imagemagick source directory. Typing a make clean instead of make would remove the old failed attempt. The number one error people get installing imagemagick are permission errors hense my post you may have to su in to do a root install or perform a non-root install.
Lets see if we can get ya going.
To CHMOD all directories under data in ftp highlight all the directories and right click. There should be a chmod selection under there. select that and type in 777
That should update all of them or you can sign into your server and type this command after your cd to your photopost directory
chmod -R 777 data
As far as watermarking is composite installed?