Troubles building m4 from pkgsrc

[Andre LeClaire <aleclaire@xxxxxxxxx>]

I'm getting an odd error message while trying to build m4 (as a 
dependency of xfce4)from pkgsrc, and would appreciate advice:

=> Bootstrap dependency digest>=20010302: found digest-20070803
===> Checking for vulnerabilities in m4-1.4.11nb1
===> Building for m4-1.4.11nb1
/usr/pkg/bin/bmake  all-recursive
Making all in .
Making all in examples
Making all in lib
/usr/pkg/bin/bmake  all-am
cc -std=gnu99  -I.      -O2 -MT freadahead.o -MD -MP -MF 
. deps/freadahead.Tpo -c -o freadahead.o freadahead.c
freadahead.c:82:3: error: #error "Please port gnulib freadahead.c to 
your platform! Look at the definition of fflush, fread, ungetc on your 
system, then report this to bug-gnulib."
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4/work/m4-1.4.11/lib
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4/work/m4-1.4.11/lib
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4/work/m4-1.4.11
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4/work/m4-1.4.11
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/m4