Cannot compile m4 1.4.18 with clang 4.0

[Thompson, KT]

As reported at https://github.com/LLNL/spack/issues/4883, there appears to be a 
problem compiling m4 (version 1.4.18) on Linux with LLVM clang 4.0.  The error 
is:

...
  CC       m4.o
  CC       builtin.o
  CC       debug.o
  CC       eval.o
  CC       format.o
  CC       freeze.o
  CC       macro.o
  CC       input.o
  CC       output.o
  CC       path.o
  CC       symtab.o
  CCLD     m4
../lib/libm4.a(xmalloc.o): In function `xnmalloc':
.../m4-1.4.18/lib/xmalloc.c:(.text+0x71): undefined reference to `__muloti4'

Is there a known work around or patch to resolve this issue?  This same version 
of m4 appears to compile w/o issue for several versions of gcc.

Thanks,

-kt