cvsup (ezm3 - modula) build error

Hello, trying to build cvsup on BETA4 results in:

---------- building m3doc in text/sgmltools ----------

/usr/ports/lang/ezm3/work/ezm3-1.2/src/../boot-FreeBSD4/m3build/FreeBSD4/m3build 
-T /usr/ports/lang/ezm3/work/ezm3-1.2/src/../m3config/src 
-F /usr/ports/lang/ezm3/work/ezm3-1.2/src/../FreeBSD4/config.tmpl 
-DUSE_M3DOC=
mkdir FreeBSD4
--- building in FreeBSD4 ---
/usr/ports/lang/ezm3/work/ezm3-1.2/src/../boot-FreeBSD4/m3ship/FreeBSD4/m3ship 
-T /usr/ports/lang/ezm3/work/ezm3-1.2/src/../m3config/src
--- shipping from FreeBSD4 ---
/usr/local/lib/m3/pkg/m3doc/FreeBSD4
   .M3EXPORTS
/usr/local/lib/m3/pkg/m3doc/src
   /usr/ports/lang/ezm3/work/ezm3-1.2/text/sgmltools/m3doc/src/m3doc.tmpl

---------- building m3core in libs ----------

/usr/ports/lang/ezm3/work/ezm3-1.2/src/../boot-FreeBSD4/m3build/FreeBSD4/m3build 
-T /usr/ports/lang/ezm3/work/ezm3-1.2/src/../m3config/src 
-F /usr/ports/lang/ezm3/work/ezm3-1.2/src/../FreeBSD4/config.tmpl 
-DUSE_M3DOC=
mkdir FreeBSD4
--- building in FreeBSD4 ---
new source -> compiling ../src/Csupport/Common/hand.c
new source -> compiling ../src/Csupport/FreeBSD4/dtoa.c
new source -> compiling ../src/runtime/common/RTHooks.i3
new source -> compiling ../src/word/Word.i3
new source -> compiling ../src/text/Text.i3
new source -> compiling ../src/thread/Common/Thread.i3
new source -> compiling ../src/runtime/common/RT0.i3
[...]
new source -> compiling ../src/unix/freebsd-4.i386/off_t_wrap.c
new source -> compiling ../src/C/Common/Cerrno.i3
new source -> compiling ../src/C/Common/Cstddef.i3
new source -> compiling ../src/C/Common/Cstdlib.i3
new source -> compiling ../src/C/Common/M3toC.i3
new source -> compiling ../src/C/Common/Cstdarg.i3
new source -> compiling ../src/C/Common/CerrnoC.c
new source -> compiling ../src/C/FreeBSD4/Csignal.i3
new source -> compiling ../src/C/FreeBSD4/Cstring.i3
new source -> compiling ../src/C/FreeBSD4/Cstdio.i3
new source -> compiling ../src/C/FreeBSD4/CstdioC.c
new source -> compiling ../src/float/IEEE/Real.i3


***
*** runtime error:
***    Segmentation violation - possible attempt to dereference NIL
***    pc = 0x8157111
***

  use option _at_M3stackdump to get a stack trace

m3build: quake error: quake error: runtime error: m3build failed with error 
code: 34304

--procedure--  -line-  -file---
error              --  <builtin>
BuildChunk        164  /usr/ports/lang/ezm3/work/ezm3-1.2/src/m3makefile
PkgInfo           240  /usr/ports/lang/ezm3/work/ezm3-1.2/src/m3makefile
                   38  /usr/ports/lang/ezm3/work/ezm3-1.2/src/PACKAGES

gmake: *** [packages] Fehler 1
*** Error code 2

Stop in /usr/ports/lang/ezm3.
*** Error code 1


Unfortunately I don't know how to use option _at_M3stackdump to get a stack 
trace...

Let me know if I can help anything,

-Mano