Hi
Just a note, So that it gets picked up by Google 
There seems to have been a change in some of the core header files. primarily lock.h and util.h
We use an app to send SMS notification of voicemail, This has compliled fine with 1.4 up until now, In 1.4.23 its failing. By commenting out lock.h it would compile but we weren’t happy with this, So on looking at bug reports we note a similar problem with imap mail and that involved autoconfig.h .
We have now added autoconfig.h to the top of our includes and this seems to solve the issue. The App compiles correctly and works as expected.