We aren't able to build gs. The make produce the following error:

writing node 'Resource/SubstCID/Korea1-WMode' len=2153
Total %rom% structure size is 7283908 bytes.
gcc  -DHAVE_MKSTEMP -DHAVE_HYPOT -DHAVE_FILE64 -DHAVE_MKSTEMP64
-DHAVE_FONTCONFIG -O2 -Wall -Wstrict-prototypes -Wundef -Wmissing-declarations
-Wmissing-prototypes -Wwrite-strings -Wno-strict-aliasing
-Wdeclaration-after-statement -fno-builtin -fno-common -DHAVE_STDINT_H
-DGX_COLOR_INDEX_TYPE="unsigned long long"  -I./obj -I./base  -o
./obj/gsromfs1.o -c ./obj/gsromfs1.c
./obj/echogs -w ./obj/ldt.tr -n - gcc  -o ./bin/gs
./obj/echogs -a ./obj/ldt.tr -n -s ./obj/gsromfs1.o ./obj/gs.o -s
cat ./obj/ld.tr >>./obj/ldt.tr
./obj/echogs -a ./obj/ldt.tr -s - -ldl -lm  -lstdc++  -lfontconfig -lpthread -lm
if [ x != x ]; then LD_RUN_PATH=; export LD_RUN_PATH; fi; \
XCFLAGS= XINCLUDE= XLDFLAGS= XLIBDIRS= XLIBS= \
FEATURE_DEVS= DEVICE_DEVS= DEVICE_DEVS1= DEVICE_DEVS2= DEVICE_DEVS3= \
DEVICE_DEVS4= DEVICE_DEVS5= DEVICE_DEVS6= DEVICE_DEVS7= DEVICE_DEVS8= \
DEVICE_DEVS9= DEVICE_DEVS10= DEVICE_DEVS11= DEVICE_DEVS12= \
DEVICE_DEVS13= DEVICE_DEVS14= DEVICE_DEVS15= DEVICE_DEVS16= \
DEVICE_DEVS17= DEVICE_DEVS18= DEVICE_DEVS19= DEVICE_DEVS20= \
DEVICE_DEVS_EXTRA= \
/bin/sh <./obj/ldt.tr
Undefined                       first referenced
 symbol                             in file
libiconv_close                      ./obj/gdevopvp.o
libiconv_open                       ./obj/gdevopvp.o
libiconv                            ./obj/gdevopvp.o
ld: fatal: Symbol referencing errors. No output written to ./bin/gs
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `bin/gs'