i have update the version of libiconv to 1.9.2 and freetype-2.1.9 
the ./configure <with options> from fontconfig-2.3.1 run's without problems but 
if i run gmake i become this strange error.

<snip>
/bin/bash ../libtool --mode=link gcc  -g -O2    -o fc-cache  fc-cache.o ../src/l
ibfontconfig.la
gcc -g -O2 -o .libs/fc-cache fc-cache.o  ../src/.libs/libfontconfig.so -L/usr/lo
cal/lib /usr/local/lib/libfreetype.so -lz /usr/lib/libexpat.so -R/usr/local/lib
Undefined                       first referenced
 symbol                             in file
libiconv_open                       ../src/.libs/libfontconfig.so
libiconv                            ../src/.libs/libfontconfig.so
ld: fatal: Symbol referencing errors. No output written to .libs/fc-cache
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `fc-cache'
blade /usr/comp/fontconfig-2.3.1/fc-cache 23:33:57 > gmake
/bin/bash ../libtool --mode=link gcc  -g -O2   -o fc-cache  fc-
cache.o ../src/libfontconfig.la
gcc -g -O2 -o .libs/fc-cache fc-cache.o  ../src/.libs/libfontconfig.so -
L/usr/local/lib /usr/local/lib/libfreetype.so -lz /usr/lib/libexpat.so -
R/usr/local/lib
Undefined                       first referenced
 symbol                             in file
libiconv_open                       ../src/.libs/libfontconfig.so
libiconv                            ../src/.libs/libfontconfig.so
ld: fatal: Symbol referencing errors. No output written to .libs/fc-cache
collect2: ld returned 1 exit status
gmake: *** [fc-cache] Error 1

i don't know now how i can solve this problem,
can you please give me any more brain tips to 
made a succesfuly Compilation for me fontconfig ver.

thanks in advance
best regards
Maurizio