Configuration files such as curl_config.h and all config-*.h no longer exist nor are generated/copied into 'src' directory, now these only exist in 'lib' directory from where curl tool sources uses them. Additionally old src/setup.h has been refactored into src/tool_setup.h which now pulls lib/setup.h The possibility of a makefile needing an include path adjustment exists.
A regression between 7.22.0 and 7.23.0 -- downloading a file with the flags -O and -J results in the content being written to stdout if and only if there was no Content-Disposition header in the http response. If there is a C-D header with a filename attribute, the output is correctly written. Reported by: Dave Reisner Bug: http://curl.haxx.se/mail/archive-2011-11/0030.html