Failed compilation of 110.56

In my system (Fedora Core 4 on an AMD64) smlnj 110.56 fails to
build with the following error:

gcc -ansi -c -O2 -DHOST_X86 -DTARGET_X86 -DOPSYS_UNIX -DOPSYS_LINUX
-D_POSIX_SOURCE -D_BSD_SOURCE -DGNU_ASSEMBLER -DDLOPEN -I../objs
-I../include ../mach-dep/unix-fault.c
In file included from ../mach-dep/unix-fault.c:15:
../mach-dep/signal-sysdep.h:408: error: redefinition of 'struct sigcontext'
../mach-dep/unix-fault.c: In function 'FaultHandler':
../mach-dep/unix-fault.c:93: warning: cast to pointer from integer of
different size
make[1]: *** [unix-fault.o] Error 1
make[1]: Leaving directory `/home/masm/tmp/smlnj/src/runtime/objs'
make: *** [all] Error 2
config/install.sh: !!! Run-time system build failed for some reason.

Marco