Missing forward slash (/) causes builds to fail

Seen in Android 2.3.5 and 2.3.7 on several occasions. Build fails because a path is incorrect due to a missing "/" when concatenating parts to build a path. It does not always appear at the same place.
Example from default.xml pandaboard:
 /bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidexternal/emma/core/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidexternal/emma/pregenerated/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidexternal/emma/core/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidexternal/emma/pregenerated/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidsdk/layoutopt/libs/uix/src/resources: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidcts/tools/cts-api-coverage/src/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidcts/tools/host/src/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidcts/tools/signature-tools/templates: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidcts/tools/tradefed-host/res: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidsdk/hierarchyviewer/src/resources: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidsdk/sdkmanager/app/src/.: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidsdk/sdkmanager/libs/sdklib/src/.: No such file or directory
/bin/bash: line 0: cd: /media/WD/src/panda/2.3.7/androidsdk/sdkmanager/libs/sdkuilib/src/.: No such file or directory

Other example:
make: *** No rule to make target `/mnt/jenkins/workspace/patrik-ryd_panda2.3.7/builddalvik/dx/src/junit/textui/TestRunner.java', needed by `out/host/common/obj/JAVA_LIBRARIES/dx_intermediates/javalib.jar'

And:
make: *** No rule to make target `/mnt/jenkins/workspace/linaro-android_panda/builddalvik/dx/src/com/android/dx/ssa/PhiInsn.java', needed by `out/host/common/obj/JAVA_LIBRARIES/dx_intermediates/javalib.jar'. Stop.

It is likely that the issue appeared between Nov. 15 and 16. The common factors between all failures is java. Many error messages seemed related to a "jar" command.

It has been seen both in local, hackbox and jenkins builds.