# Known Problems in R3.16.1

# EPICS Base R3.16.1: Known Problems

Any patch files linked below should be applied at the root of the base-3.16.1 tree. Download them, then use the GNU Patch program as follows:

>     % cd /path/to/base-3.16.1
>     % patch -p0 < /path/to/file.patch

The following problems were known by the developers at the time of this release:

- IOCs running on some versions of Cygwin may display warnings at iocInit about duplicate EPICS CA Address list entries. These warnings might be due to a bug in Cygwin; they are benign and can be ignored.
- 64-bit Windows builds of the CAS library may not work with some compilers. The code in `src/legacy/gdd` is incompatible with the LLP64 model that Windows uses for its 64-bit ABI.