i2c problems on raspberry pi 3b+ on slackware-current

I have a raspberry pi 3b+ running 14.2 that uses a ds1307 to keep time between reboots. It works flawlessly. When I run the same hardware using current doing the same setup it does not work. When I run i2cdetect -y 1 i get this output:
Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory. What has changed in current and what do I need to do to get the i2c bus working? Thanks for any help