Core

I just tried to do a fresh install of Typo3 4.6.1 based on the blank package.
When opening the install tool, the page is blank. The Apache error log contains the following entry:

[Mon Dec 05 16:39:30 2011] [error] [client 127.0.0.1] PHP Fatal error:  Uncaught exception 'RuntimeException' with message 'Could not create directory!' in /var/www/typo3_src-4.6.1/t3lib/class.t3lib_div.php:2970\nStack trace:\n#0 /var/www/typo3_src-4.6.1/t3lib/cache/backend/class.t3lib_cache_backend_filebackend.php(201): t3lib_div::mkdir_deep('/var/www/typo3t...')\n#1 /var/www/typo3_src-4.6.1/t3lib/cache/backend/class.t3lib_cache_backend_filebackend.php(99): t3lib_cache_backend_FileBackend->createFinalCacheDirectory('/var/www/typo3t...')\n#2 /var/www/typo3_src-4.6.1/t3lib/cache/frontend/class.t3lib_cache_frontend_abstractfrontend.php(63): t3lib_cache_backend_FileBackend->setCache(Object(t3lib_cache_frontend_PhpFrontend))\n#3 /var/www/typo3_src-4.6.1/t3lib/cache/frontend/class.t3lib_cache_frontend_phpfrontend.php(45): t3lib_cache_frontend_AbstractFrontend->__construct('cache_phpcode', Object(t3lib_cache_backend_FileBackend))\n#4 [internal function]: t3lib_cache_frontend_PhpFrontend->__construct('cache_phpcode', Object(t3lib_cache_backend_FileBackend))\n#5 /var/www/typo3_src-4.6.1/t3lib/c in /var/www/typo3_src-4.6.1/t3lib/cache/backend/class.t3lib_cache_backend_filebackend.php on line 203

Please note that the exception does not contain any clear indication about what directory could not be created. The user is left to figure that out on his/her own.

After making typo3temp writeable for the user apache runs as, the install tool is available.