ldc version 0.9.2+hg1655-0ubuntu3 failed to build on i386

ldc version 0.9.2+hg1655-0ubuntu3 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2398499

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2398499/+files/buildlog_ubuntu-natty-i386.ldc_0.9.2%2Bhg1655-0ubuntu3_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 941 lines into the build log:

Now at patch 07_link_shlib.diff
touch debian/stamp-patched
dh_testdir
LDFLAGS='-Wl,-Bsymbolic-functions' CXXFLAGS='-g -O2' \
  cmake -DCMAKE_INSTALL_PREFIX='/usr' .
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found Perl: /usr/bin/perl
-- checking for one of the modules 'libconfig++'
CMake Error at CMakeLists.txt:32 (message):
  llvm not found

-- Configuring incomplete, errors occurred!
make: *** [configure-stamp] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-1030
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/ldc-0.9.2+hg1655