I tried to follow the instructions on https://github.com/teiid/salesforce to build a newer adapter/translator pair but I was not even able to build the provided v34 pair.
The "mvn clean install" produce the following error:
[INFO] ------------------------------------------------------------------------
[INFO] Building Salesforce Resource Adapter API 34 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: https://repository.jboss.org/nexus/content/repositories/thirdparty-uploads/org/jboss/teiid/connectors/connector-salesforce/9.0.0.Final/connector-salesforce-9.0.0.Final.rar
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Salesforce API 34 .................................. SUCCESS [ 1.091 s]
[INFO] Salesforce Translator 34 ........................... SUCCESS [ 2.105 s]
[INFO] Salesforce Resource Adapter API 34 ................. FAILURE [ 1.596 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.490 s
[INFO] Finished at: 2017-09-20T11:13:59+02:00
[INFO] Final Memory: 35M/425M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project connector-salesforce-34: Could not resolve dependencies for project org.jboss.teiid.connectors.salesforce-34:connector-salesforce-34:jar:1.0-SNAPSHOT: Could not find artifact org.jboss.teiid.connectors:connector-salesforce:rar:9.0.0.Final in thirdparty-uploads (https://repository.jboss.org/nexus/content/repositories/thirdparty-uploads/) -> [Help 1]

After removing the dependencies block in the ...\connector-salesforce-34\pom.xml maven works, but it seems to create an invalid adapter.