>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/sys-apps/busybox-1.4.2/work/busybox-1.4.2 ...
  SPLIT   include/autoconf.h -> include/config/*
  GEN     include/bbconfigopts.h
  HOSTCC  applets/usage
  LD      archival/built-in.o
/bin/sh: i686-pc-linux-gnu-ar: command not found
make[1]: *** [archival/built-in.o] Error 127
make: *** [archival] Error 2
make: *** Waiting for unfinished jobs....
  CC      applets/busybox.o
  GEN     include/usage_compressed.h
  CC      applets/applets.o
  LD      applets/built-in.o

!!! ERROR: sys-apps/busybox-1.4.2 failed.
Call stack:
  ebuild.sh, line 1615:   Called dyn_compile
  ebuild.sh, line 972:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  busybox-1.4.2.ebuild, line 168:   Called die

!!! build failed
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/sys-apps/busybox-1.4.2/temp/build.log'.