The File Geodatabase API 1.5 is now available for download from GitHub https://github.com/Esri/file-geodatabase-api/tree/master/FileGDB_API_1.5. The FileGDB 1.5 release is primarily a maintenance release with the addition of  a few new compilers and platforms.
 
What’s new at 1.5:
- MS Visual Studio 2015 support.
- Allow the use of the Spatial Reference ID to create the spatial reference (BUG-000100781)
- Support for new operating system versions:
Linux:
     Red Hat
     SUSE Linux Enterprise Server
     Ubuntu
Windows:
     Windows 8.1
     Windows 10.0
MacOS
     Yosemite (10.10)
     El Capitan (10.11)
     Sierra (10.12)
 
Released under the Apache license.
 
Fixed Issues:
BUG-000100782 File Geodatabase: COUNT(0) should return 0 with a WHERE clause that returns no rows (1=0).
BUG-000100783 Remove Windows FileGDBAPI.dll's reliance on Microsoft.VC90.CRT.
BUG-000088293 FileGDB API throws -2147217395 error when executing SQL query with SQL functions.
BUG-000097116 Table::FreeWriteLock does not clear the lock.