strange error when running jtreg tests

[Maurizio Cimadamore]

Hi,

I've encountered this error when running jtreg tests from make using the 
following command line

make test JT_HOME=<path to latest jtreg> TEST=jdk_util

  * For target 
support_test_hotspot_jtreg_native_support_exeinvoke_BUILD_TEST_invoke_link:
/w/lt/9/dev/build/linux-x86_64-normal-server-release/support/test/hotspot/jtreg/native/support/exeinvoke/exeinvoke.o: 
In function `main':
/w/lt/9/dev/hotspot/make/test/../../test/runtime/StackGuardPages/exeinvoke.c:253: 
undefined reference to `JNI_CreateJavaVM'
/w/lt/9/dev/hotspot/make/test/../../test/runtime/StackGuardPages/exeinvoke.c:264: 
undefined reference to `pthread_create'
/w/lt/9/dev/hotspot/make/test/../../test/runtime/StackGuardPages/exeinvoke.c:265: 
undefined reference to `pthread_join'
/w/lt/9/dev/hotspot/make/test/../../test/runtime/StackGuardPages/exeinvoke.c:277: 
undefined reference to `pthread_create'
/w/lt/9/dev/hotspot/make/test/../../test/runtime/StackGuardPages/exeinvoke.c:278: 
undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
=== End of repeated output ===


This appeared after I refreshed my repo with latest sources. Anybody has 
any clue as to what this is?

Maurizio