devel/libslang2 not compiling on -current

[Stefano Marinelli <postnet%dragas.dyndns.org@localhost>]

Hello,
trying to compile sysutils/mc on a NetBSD current (amd64) but devel/libslang2 
fails:

===> Building for libslang2-2.2.2nb2
cd src; /usr/pkg/bin/gmake elf
gmake[1]: Entering directory `/usr/pkgsrc/devel/libslang2/work/slang-2.2.2/src'
Makefile:453: warning: overriding recipe for target `calc'
Makefile:451: warning: ignoring old recipe for target `calc'
Makefile:460: warning: overriding recipe for target `untic'
Makefile:458: warning: ignoring old recipe for target `untic'
cd .; libtool  --mode=link  \
        gcc -o libslang2.la sltermin.lo sldisply.lo slutty.lo slang.lo 
slarray.lo slclass.lo slcmd.lo slerr.lo slgetkey.lo slkeymap.lo slmalloc.lo 
slmath.lo slmemchr.lo slmemcmp.lo slmemcpy.lo slmemset.lo slmisc.lo slparse.lo 
slprepr.lo slregexp.lo slrline.lo slsearch.lo slsmg.lo slstd.lo sltoken.lo 
sltypes.lo slxstrng.lo slcurses.lo slscroll.lo slsignal.lo slkeypad.lo 
slerrno.lo slstring.lo slstruct.lo slcmplex.lo slarrfun.lo slimport.lo 
slpath.lo slarith.lo slassoc.lo slcompat.lo slposdir.lo slstdio.lo slproc.lo 
sltime.lo slstrops.lo slbstr.lo slpack.lo slintall.lo slistruc.lo slposio.lo 
slnspace.lo slarrmis.lo slospath.lo slscanf.lo sllower.lo slupper.lo 
slischar.lo slutf8.lo slwcwidth.lo slwclut.lo slcommon.lo sllist.lo slexcept.lo 
slfpu.lo slsig.lo slboseos.lo \
                 -rpath /usr/pkg/lib \
                 -lm -ltermcap -version-info 2:1
libtool: link: unable to infer tagged configuration
libtool: link: specify a tag with `--tag'
gmake[1]: *** [libslang2.la] Error 1
gmake[1]: Leaving directory `/usr/pkgsrc/devel/libslang2/work/slang-2.2.2/src'
gmake: *** [elf] Error 2
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/devel/libslang2
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/libslang2
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/sysutils/mc

Thank you,
Stefano