unlike Borland RAD Studio 2009 C++ Builder 6 installs without issues in wine (tested: 6.22).
while at it, install also service pack 4 (contains sp1-3 too): http://altd.codegear.com/devsupport/cbuilder/cb6/bcb6_eng_ent_upd4.exe sha256sum 49d72403d29922633c65457e160e6a029f4a26eaa61a486942b4a419f9a73e4b