I am running into problems building GCC under cygwin.   I ran the configure like this:   gcc/configure --prefix=/usr --with-as=/usr/i686-pc-cygwin/bin/as.exe --with-ld=/usr/i686-pc-cygwin/bin/ld.exe --enable-threads   It configured and everything, but when I run the make bootstrap, it runs for a while and then fails with this error:   gcc -c  -DIN_GCC     -g  -DHAVE_CONFIG_H    -I. -I../gcc/gcc -I../gcc/gcc/config  -I../gcc/gcc/../include ../gcc/gcc/cp/g++spec.c In file included from ../gcc/gcc/cp/g++spec.c:22: ../gcc/gcc/system.h:491: libiberty.h: No such file or directory make[2]: *** [g++spec.o] Error 1 make[2]: Leaving directory `/objdir/gcc' make[1]: *** [bootstrap] Error 2 make[1]: Leaving directory `/objdir/gcc' make: *** [bootstrap] Error 2   Is there something wrong with the way I have set up paths or something?   Thanks!   -Vivin