LinuxQuestions.org - How to install libgcj into centOS 7

Hello everyone

I'm puzzled. Now I want to install pkftk software to CentOS7. pkftk require libgcj. But libgcj didn't was installed into my OS and so I try to install libgcj. However I couldn't find libgcj for 64bit-OS and then I think that when gcj is installed, libgcj will is installed together.
Is That right? However errors happen like following
question 1: Is there libgcj for 64-bit OS?
question 2: What I should do for avoiding errors?

bellow error and message are translated from japanese to English

as for libgcj-2.95.1
Configuring for a x86_64-unknown-linux-gnu host.
*** Cannot currently configure in source tree.

as for gcc-5.1.0
./configure --disable-multilib --enable-languages=c,c++,java,objc,fortran
make "AR_FLAGS=rc" "CC_FOR_BUILD=gcc" "CFLAGS=-g" "CXXFLAGS=-g" "CFLAGS_FOR_BUILD=-g -O2" "CFLAGS_FOR_TARGET=-g -O2" "INSTALL=/usr/bin/install -c" "INSTALL_DATA=/usr/bin/install -c -m 644" "INSTALL_PROGRAM=/usr/bin/install -c" "INSTALL_SCRIPT=/usr/bin/install -c" "LDFLAGS=" "LIBCFLAGS=-g -O2" "LIBCFLAGS_FOR_TARGET=-g -O2" "MAKE=make" "MAKEINFO=makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000 " "PICFLAG=" "PICFLAG_FOR_TARGET=" "SHELL=/bin/sh" "EXPECT=expect" "RUNTEST=runtest" "RUNTESTFLAGS=" "exec_prefix=/usr/local" "infodir=/usr/local/share/info" "libdir=/usr/local/lib" "prefix=/usr/local" "tooldir=/usr/local/x86_64-unknown-linux-gnu" "AR=ar" "AS=as" "CC=gcc" "CXX=g++" "LD=ld" "LIBCFLAGS=-g -O2" "NM=nm" "PICFLAG=" "RANLIB=ranlib" "DESTDIR=" DO=all multi-do # make
make[4]: directory enter `/home/yuu/desktop/gcc-5.1.0/host-x86_64-unknown-linux-gnu/zlib'
if [ -z "32" ]; then \
true; \
else \
rootpre=`${PWDCMD-pwd}`/; export rootpre; \
srcrootpre=`cd ../.././zlib; ${PWDCMD-pwd}`/; export srcrootpre; \
lib=`echo "${rootpre}" | sed -e 's,^.*/$[^/][^/]*$/$,\1,'`; \
compiler="gcc"; \
for i in `${compiler} --print-multi-lib 2>/dev/null`; do \
dir=`echo $i | sed -e 's/;.*$//'`; \
if [ "${dir}" = "." ]; then \
true; \
else \
if [ -d ../${dir}/${lib} ]; then \
flags=`echo $i | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`; \
if (cd ../${dir}/${lib}; make \
CFLAGS="-g ${flags}" \
CCASFLAGS=" ${flags}" \
FCFLAGS=" ${flags}" \
FFLAGS=" ${flags}" \
ADAFLAGS=" ${flags}" \
prefix="/usr/local" \
exec_prefix="/usr/local" \
GCJFLAGS=" ${flags}" \
GOCFLAGS=" ${flags}" \
CXXFLAGS="-g ${flags}" \
LIBCFLAGS="-g -O2 ${flags}" \
LIBCXXFLAGS="-g -O2 -fno-implicit-templates ${flags}" \
LDFLAGS=" ${flags}" \
MULTIFLAGS="${flags}" \
DESTDIR="" \
INSTALL="/usr/bin/install -c" \
INSTALL_DATA="/usr/bin/install -c -m 644" \
INSTALL_PROGRAM="/usr/bin/install -c" \
INSTALL_SCRIPT="/usr/bin/install -c" \
all); then \
true; \
else \
exit 1; \
fi; \
else true; \
fi; \
fi; \
done; \
fi
make[5]: directory enter `/home/yuu/desktop/gcc-5.1.0/host-x86_64-unknown-linux-gnu/32/zlib'
make[5]: *** target there isn't role to `all' for make. cancel.
make[5]: directory go out from `/home/yuu/desktop/gcc-5.1.0/host-x86_64-unknown-linux-gnu/32/zlib'
make[4]: *** [multi-do] error 1
make[4]: directory go out from`/home/yuu/desktop/gcc-5.1.0/host-x86_64-unknown-linux-gnu/zlib'
make[3]: *** [all-multi] error 2
make[3]: directory go out from `/home/yuu/desktop/gcc-5.1.0/host-x86_64-unknown-linux-gnu/zlib'
make[2]: *** [all-stage1-zlib] error 2
make[2]: directory go out from `/home/yuu/desktop/gcc-5.1.0'
make[1]: *** [stage1-bubble] error 2
make[1]: directory `/home/