Error while installing swi-prolog5.6.48(macport 1.6)

[Stellit Woo]

I just update my macport to 1.6 and try to install swi-prolog under  
1.6(which has some problem under macport 1.5).
But I got this error during build phase:
 > -----------------------------
--->  Building swi-prolog with target all
Error: Target org.macports.build returned: shell command " cd "/opt/ 
local/var/macports/build/ 
_opt_local_var_macports_sources_rsync 
.macports.org_release_ports_lang_swi-prolog/work/pl-5.6.48" && make  
all " returned error 2
Command output: config.status: creating Makefile
config.status: creating config.h
touch .pkg-config
cd packages && make
for p in clib cpp odbc table xpce sgml sgml/RDF semweb http chr clpqr  
nlp ssl pldoc plunit jpl zlib; do \
	    if [ -r $p/Makefile ]; then make -C $p || exit 1; fi; \
         done
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o random.o random.c
../plld.sh -shared -o random.dylib random.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o error.o error.c
error.c: In function 'pl_error':
error.c:78: warning: unused variable 'argn'
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o process.o process.c
../plld.sh -shared -o unix.dylib error.o process.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o socket.o socket.c
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o nonblockio.o nonblockio.c
../plld.sh -shared -o socket.dylib error.o socket.o nonblockio.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o form.o form.c
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o cgi.o cgi.c
../plld.sh -shared -o cgi.dylib error.o form.o cgi.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o memfile.o memfile.c
../plld.sh -shared -o memfile.dylib error.o memfile.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o files.o files.c
../plld.sh -shared -o files.dylib error.o files.o
../plld.sh -O2 -fno-strict-aliasing -Wall -fpic -I. -Imaildrop/rfc2045  
-Imaildrop/rfc822 -DHAVE_CONFIG_H   -c -o mime.o mime.c
(cd maildrop/rfc2045 && make)
make[3]: *** No targets specified and no makefile found.  Stop.
make[2]: *** [maildrop/rfc2045/librfc2045.a] Error 2
make[1]: *** [objects] Error 1
make: *** [packages] Error 2

Error: Status 1 encountered during processing.
 > ---------------
Is anyone also has the same problem ? How can I solve this problem ?
Thanks!

Regard,
Stellit