4.2.0.0.alpha1 build error

I'm getting this error with alpha1 build:

File tested,Execution Time (ms)
zoom.docx,76
ooxmlexport.cxx:546:Assertion
Test name: test1Table1Page::Import
equality assertion failed
- Expected: 1
- Actual  : 2

ooxmlexport.cxx:546:Assertion
Test name: test1Table1Page::Import_Export_Import
equality assertion failed
- Expected: 1
- Actual  : 2

Failures !!!
Run: 162   Failure total: 2   Failures: 2   Errors: 0

Error: a unit test failed, please do one of:

export DEBUGCPPUNIT=TRUE            # for exception catching
export CPPUNITTRACE="gdb --args" # for interactive debugging on linux
export CPPUNITTRACE=""[full path to devenv.exe]" /debugexe" # for interactive debugging in Visual 
Studio
export VALGRIND=memcheck            # for memory checking

and retry using: make CppunitTest_sw_ooxmlexport

/build/libreoffice/src/libreoffice-4.2.0.0.alpha1/solenv/gbuild/CppunitTest.mk:77: recipe for 
target 
'/build/libreoffice/src/libreoffice-4.2.0.0.alpha1/workdir/unxlngx6.pro/CppunitTest/sw_ooxmlexport.test'
 failed
make[1]: *** 
[/build/libreoffice/src/libreoffice-4.2.0.0.alpha1/workdir/unxlngx6.pro/CppunitTest/sw_ooxmlexport.test]
 Error 1
Makefile:238: recipe for target 'build' failed
make: *** [build] Error 2


Could some system lib cause this or is it a known issue?

-Andy
ArchLinux