checking how to run the C preprocessor... /lib/cpp
configure: error: in `/tmp/build/gcc/src/gcc-build/x86_64-unknown-linux-gnu/libgcc':
configure: error: C preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.
make[1]: *** [configure-target-libgcc] Error 1
make[1]: Leaving directory `/tmp/build/gcc/src/gcc-build'
make: *** [all] Error 2

configure:3923: /lib/cpp  conftest.c
/tmp/build/gcc/src/gcc-4.8.1/libgcc/configure: line 1456: /lib/cpp: No such file or directory
configure:3923: $? = 127
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"
| /* end confdefs.h.  */
| #ifdef __STDC__
| # include <limits.h>
| #else
| # include <assert.h>
| #endif
| 		     Syntax error
configure:3953: error: in `/tmp/build/gcc/src/gcc-build/x86_64-unknown-linux-gnu/libgcc':
configure:3956: error: C preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.

## ---------------- ##
## Cache variables. ##
## ---------------- ##

ac_cv_build=x86_64-unknown-linux-gnu
ac_cv_c_compiler_gnu=yes
ac_cv_env_CC_set=set
ac_cv_env_CC_value='/tmp/build/gcc/src/gcc-build/./gcc/xgcc -B/tmp/build/gcc/src/gcc-build/./gcc/ -B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/lib/ -isystem /usr/x86_64-unknown-linux-gnu/include -isystem /usr/x86_64-unknown-linux-gnu/sys-include   '
ac_cv_env_CFLAGS_set=set
ac_cv_env_CFLAGS_value='-g -O2'
ac_cv_env_CPPFLAGS_set=set
ac_cv_env_CPPFLAGS_value=
ac_cv_env_CPP_set=
ac_cv_env_CPP_value=
ac_cv_env_LDFLAGS_set=set
ac_cv_env_LDFLAGS_value=
ac_cv_env_LIBS_set=
ac_cv_env_LIBS_value=
ac_cv_env_build_alias_set=set
ac_cv_env_build_alias_value=x86_64-unknown-linux-gnu
ac_cv_env_host_alias_set=set
ac_cv_env_host_alias_value=x86_64-unknown-linux-gnu
ac_cv_env_target_alias_set=set
ac_cv_env_target_alias_value=x86_64-unknown-linux-gnu
ac_cv_host=x86_64-unknown-linux-gnu
ac_cv_objext=o
ac_cv_prog_AR=ar
ac_cv_prog_AWK=gawk
ac_cv_prog_CC='/tmp/build/gcc/src/gcc-build/./gcc/xgcc -B/tmp/build/gcc/src/gcc-build/./gcc/ -B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/lib/ -isystem /usr/x86_64-unknown-linux-gnu/include -isystem /usr/x86_64-unknown-linux-gnu/sys-include   '
ac_cv_prog_CPP=/lib/cpp
ac_cv_prog_LIPO=lipo
ac_cv_prog_NM=/tmp/build/gcc/src/gcc-build/./gcc/nm
ac_cv_prog_RANLIB=ranlib
ac_cv_prog_STRIP=strip
ac_cv_prog_cc_c89=
ac_cv_prog_cc_g=yes

## ----------------- ##
## Output variables. ##
## ----------------- ##

AR='ar'
AWK='gawk'
CC='/tmp/build/gcc/src/gcc-build/./gcc/xgcc -B/tmp/build/gcc/src/gcc-build/./gcc/ -B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/lib/ -isystem /usr/x86_64-unknown-linux-gnu/include -isystem /usr/x86_64-unknown-linux-gnu/sys-include   '
CFLAGS='-g -O2'
CPP='/lib/cpp'
CPPFLAGS=''
DEFS=''
ECHO_C=''
ECHO_N='-n'
ECHO_T=''
EXEEXT=''
INSTALL_DATA='/tools/bin/install -c -m 644'
INSTALL_PROGRAM='/tools/bin/install -c'
INSTALL_SCRIPT='/tools/bin/install -c'
LDFLAGS=''
LIBOBJS=''
LIBS=''
LIPO='lipo'
LN_S='ln -s'
LTLIBOBJS=''
MAINT='#'
NM='/tmp/build/gcc/src/gcc-build/./gcc/nm'
OBJEXT='o'
PACKAGE_BUGREPORT=''
PACKAGE_NAME='GNU C Runtime Library'
PACKAGE_STRING='GNU C Runtime Library 1.0'
PACKAGE_TARNAME='libgcc'
PACKAGE_URL='http://www.gnu.org/software/libgcc/'
PACKAGE_VERSION='1.0'
PATH_SEPARATOR=':'
PICFLAG='-fpic'
RANLIB='ranlib'
SHELL='/bin/sh'
STRIP='strip'
ac_ct_CC=''
asm_hidden_op=''
bindir='${exec_prefix}/bin'
build='x86_64-unknown-linux-gnu'
build_alias='x86_64-unknown-linux-gnu'
build_cpu='x86_64'
build_libsubdir='build-x86_64-unknown-linux-gnu'
build_os='linux-gnu'
build_subdir='build-x86_64-unknown-linux-gnu'
build_vendor='unknown'
cpu_type=''
datadir='${datarootdir}'
datarootdir='${prefix}/share'
decimal_float=''
docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
double_type_size=''
dvidir='${docdir}'
enable_decimal_float=''
enable_shared='yes'
exec_prefix='NONE'
extra_parts=''
fixed_point=''
host='x86_64-unknown-linux-gnu'
host_alias='x86_64-unknown-linux-gnu'
host_cpu='x86_64'
host_noncanonical='x86_64-unknown-linux-gnu'
host_os='linux-gnu'
host_subdir='.'
host_vendor='unknown'
htmldir='${docdir}'
includedir='${prefix}/include'
infodir='${datarootdir}/info'
libdir='/usr/lib'
libexecdir='/usr/lib'
libgcc_topdir='../../../gcc-4.8.1/libgcc/..'
localedir='${datarootdir}/locale'
localstatedir='${prefix}/var'
long_double_type_size=''
mandir='${datarootdir}/man'
oldincludedir='/usr/include'
pdfdir='${docdir}'
prefix='/usr'
program_transform_name='s,y,y,'
psdir='${docdir}'
sbindir='${exec_prefix}/sbin'
set_have_cc_tls=''
set_use_emutls=''
sfp_machine_header=''
sharedstatedir='${prefix}/com'
slibdir='$(libdir)'
sysconfdir='${prefix}/etc'
target_alias='x86_64-unknown-linux-gnu'
target_noncanonical='x86_64-unknown-linux-gnu'
target_subdir='x86_64-unknown-linux-gnu'
thread_header=''
tm_defines=''
tm_file=''
tmake_file=''
toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
toolexeclibdir='$(libdir)/../lib'
vis_hide=''

## ----------- ##
## confdefs.h. ##
## ----------- ##

/* confdefs.h */
#define PACKAGE_NAME "GNU C Runtime Library"
#define PACKAGE_TARNAME "libgcc"
#define PACKAGE_VERSION "1.0"
#define PACKAGE_STRING "GNU C Runtime Library 1.0"
#define PACKAGE_BUGREPORT ""
#define PACKAGE_URL "http://www.gnu.org/software/libgcc/"

configure: exit 1

/lib/cpp: No such file or directory