Hello All, I am trying to build GCC cross compiler for V850, I am using the following files gcc-4.3.3 binutils-2.19.1 for configuration I used the following options $ ../Gcc_Source/gcc-4.3.3/configure --target=v850-elf --host=i686-pc-cygwin -enable-language=c --prefix=c:/gcc/v850 --with-gnu-as --with-gnuld --disable-win32-registry after the config I used $ make now I got the error as gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../Gcc_Source/gcc-4.3.3/libiberty/../incl ude -W -Wall -Wwrite-strings -Wstrict-prototypes -pedantic ../../Gcc_Source/gc c-4.3.3/libiberty/pex-unix.c -o pex-unix.o ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: In function `pex_wait': ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:223: warning: implicit declarati on of function `wait' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: At top level: ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:356: warning: function declarati on isn't a prototype ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: In function `pex_unix_exec_chil d': ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:375: warning: implicit declarati on of function `fork' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:378: warning: implicit declarati on of function `sleep' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:428: warning: passing arg 2 of ` execvp' from incompatible pointer type ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:433: warning: passing arg 2 of ` execv' from incompatible pointer type ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: In function `pex_unix_wait': ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:484: warning: implicit declarati on of function `kill' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: In function `pex_unix_pipe': ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:502: warning: implicit declarati on of function `pipe' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c: In function `pex_unix_fdopenw': ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:518: warning: implicit declarati on of function `fcntl' ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:518: error: `F_SETFD' undeclared (first use in this function) ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:518: error: (Each undeclared ide ntifier is reported only once ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:518: error: for each function it appears in.) ../../Gcc_Source/gcc-4.3.3/libiberty/pex-unix.c:518: error: `FD_CLOEXEC' undecla red (first use in this function) make[2]: *** [pex-unix.o] Error 1 make[2]: Leaving directory `/cygdrive/c/temp/gcc_Installation/libiberty' make[1]: *** [all-libiberty] Error 2 make[1]: Leaving directory `/cygdrive/c/temp/gcc_Installation' make: *** [all] Error 2 Can any one help me to fix the issue. With Thanks & Regards, Gowrisankar Loganathan _________________________________________________________________ Windows Live Messenger. Multitasking at its finest. http://www.microsoft.com/india/windows/windowslive/messenger.aspx