[Libreoffice] Building problem, cppunit, libcppunit undefined reference to dlopen

I missed the e-mail about moving from rawbuild to native build, so I did
remove the old installation.
Then I did a new Native Build installation as described on the wiki page.

I failed with this dl problem in cppunit:

make[2]: Entering directory
`/home/joost/work/git/libo/clone/libs-extern/cppunit/
unxlngx6.pro/misc/build/cppunit-1.12.1/src/DllPlugInTester'
/bin/sh ../../libtool --tag=CXX   --mode=link g++   -ldl  -o DllPlugInTester
DllPlugInTester.o CommandLineParser.o ../../src/cppunit/libcppunit.la -lm
g++ -o .libs/DllPlugInTester DllPlugInTester.o CommandLineParser.o  -ldl
../../src/cppunit/.libs/libcppunit.so -lm  -Wl,--rpath
-Wl,/home/joost/work/git/libo/clone/libs-extern/cppunit/
unxlngx6.pro/misc/build/cppunit-1.12.1/ooo-install/lib
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlsym'
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlopen'
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlclose'
collect2: ld returned 1 exit status
make[2]: *** [DllPlugInTester] Error 1
make[2]: Leaving directory
`/home/joost/work/git/libo/clone/libs-extern/cppunit/
unxlngx6.pro/misc/build/cppunit-1.12.1/src/DllPlugInTester'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory
`/home/joost/work/git/libo/clone/libs-extern/cppunit/
unxlngx6.pro/misc/build/cppunit-1.12.1/src'
make: *** [install-recursive] Error 1
dmake:  Error code 2, while making './
unxlngx6.pro/misc/build/so_built_cppunit'


Re-installing glibc and glibc32 did not solve the problem.

I am running on OpenSuse (64bits).

Joost