eu consigo configurar normalmente, e soh adiantando a Libiconv tah instalada
./configure --sysconfdir=/etc --prefix=/usr --mandir=/usr/share/man
OK
make
...
Making all in fc-cache
make[2]: Entering directory `/tmp/fontconfig-2.2.99/fc-cache'
/bin/sh ../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
../src/.libs/libfontconfig.so: undefined reference to `libiconv_open'
../src/.libs/libfontconfig.so: undefined reference to `libiconv'
collect2: ld returned 1 exit status
make[2]: *** [fc-cache] Error 1
make[2]: Leaving directory `/tmp/fontconfig-2.2.99/fc-cache'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/fontconfig-2.2.99'
make: *** [all] Error 2
---
Libiconv:
whereis libiconv
libiconv: /usr/local/lib/libiconv.so /usr/local/lib/libiconv.la
/usr/local/lib/libiconv.a