You made a symlink for the apachectl binary and not the apache2 binary. Please remove this and craete a correct symlink. apachectl != apache.
./setup2: line 862: ispconfig_tmp/php/bin/php: No such file or directory
ERROR: The PHP binary coming with ISPConfig does not work properly on your system! The installation routine stops here!
Please post the exact errors that occured before in the compile output and not just the final error.