Verify now fails but no changes since Nov

I have not made any modifications to this since back in November but now fails the verification. How is this possible ???

In file included from tank-temp-rjw2.cpp:8:0:
This looks like an error in spark-dallas-temperature library. Would you like to create an issue on GitHub to let the author know?
spark-dallas-temperature/spark-dallas-temperature.h:24:25: fatal error: OneWire.h: No such file or directory
#include <OneWire.h>

compilation terminated.
make[1]: *** […/build/target/user/platform-6tank-temp-rjw2.o] Error 1
make: *** [user] Error 2

Libraries 2.0 and firmware system 0.6.1 was released since then. So one of the two may have contributed to this.
Just check what system version your are targeting. Maybe reverting to 0.6.0 might help.
If you can post a screenshot of your IDE window which also shows the imported libraries we might be able to spot something.
But the error message indicates that you don’t have the OneWire library imported into your project.

Thanks, all on my programs using the spark-dallas-temperature library fail verification unless i set the target back to 0.6.0
So, is that a problem with the lib. ?

Hence I’ve already filed an issue on the lib

Thanks for your help and info.