Check out frysk cvs head, and build it on FC5 for ppc64.  The error could seen
as follows,

make[3]: Entering directory `/home/qiyao/build-frysk-qiyao/frysk-imports'
source='../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx'
object='lib/unwind/cni/FrameCursor.o' libtool=no \
DEPDIR=.deps depmode=none /bin/sh ../../frysk-qiyao/frysk-imports/depcomp \
g++ -m64 -DPACKAGE_NAME=\"frysk\" -DPACKAGE_TARNAME=\"frysk\"
-DPACKAGE_VERSION=\"0.0.1.2006.07.13\" -DPACKAGE_STRING=\"frysk\
0.0.1.2006.07.13\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE=\"frysk\"
-DVERSION=\"0.0.1.2006.07.13\"  -I. -I../../frysk-qiyao/frysk-imports   
-I../../frysk-qiyao/frysk-imports -I.
-I../../frysk-qiyao/frysk-imports/../frysk-imports/elfutils/libelf
-I../../frysk-qiyao/frysk-imports/../frysk-imports/elfutils/libdw
-I../../frysk-qiyao/frysk-imports/../frysk-imports/elfutils/libdwfl
-I../../frysk-qiyao/frysk-imports/../frysk-imports/libunwind/include
-I./../frysk-imports/libunwind/include -Werror -Wall -fPIC  -g -O -c -o
lib/unwind/cni/FrameCursor.o
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:39:23: error:
libunwind.h: No such file or directory
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx: In member
function ¡®void lib::unwind::FrameCursor::create_frame_cursor(jlong)¡¯:
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:47: error:
¡®::unw_cursor_t¡¯ has not been declared
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:47: error:
¡®cursor¡¯ was not declared in this scope
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:47: error:
¡®::unw_cursor_t¡¯ has not been declared
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:47: error:
expected primary-expression before ¡®)¡¯ token
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:47: error:
expected `;' before ¡®_cursor¡¯
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:49: error:
¡®::unw_cursor_t¡¯ has not been declared
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:49: error:
¡®native_cursor¡¯ was not declared in this scope
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:49: error:
¡®::unw_cursor_t¡¯ has not been declared
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:49: error:
expected primary-expression before ¡®)¡¯ token
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:49: error:
expected `;' before ¡®JvMalloc¡¯
../../frysk-qiyao/frysk-imports/lib/unwind/cni/FrameCursor.cxx:52: error:
¡®::unw_cursor_t¡¯ has not been declared
make[3]: *** [lib/unwind/cni/FrameCursor.o] Error 1
make[3]: Leaving directory `/home/qiyao/build-frysk-qiyao/frysk-imports'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/qiyao/build-frysk-qiyao/frysk-imports'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/qiyao/build-frysk-qiyao/frysk-imports'
make: *** [all-recursive] Error 1
[qiyao@plinuxt18 build-frysk-qiyao]$