emerge -av busybox

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] sys-apps/busybox-1.4.1-r2 [1.2.2.1] USE="-debug -make-symlinks -savedconfig -static (-netboot%)" 0 kB 

Total: 1 package (1 upgrade), Size of downloads: 0 kB

Would you like to merge these packages? [Yes/No] yes

>>> Emerging (1 of 1) sys-apps/busybox-1.4.1-r2 to /
 * busybox-1.4.1.tar.bz2 RMD160 ;-) ...                                                                                       [ ok ]
 * busybox-1.4.1.tar.bz2 SHA1 ;-) ...                                                                                         [ ok ]
 * busybox-1.4.1.tar.bz2 SHA256 ;-) ...                                                                                       [ ok ]
 * busybox-1.4.1.tar.bz2 size ;-) ...                                                                                         [ ok ]
 * checking ebuild checksums ;-) ...                                                                                          [ ok ]
 * checking auxfile checksums ;-) ...                                                                                         [ ok ]
 * checking miscfile checksums ;-) ...                                                                                        [ ok ]
 * checking busybox-1.4.1.tar.bz2 ;-) ...                                                                                     [ ok ]
>>> Unpacking source...
>>> Unpacking busybox-1.4.1.tar.bz2 to /var/tmp/portage/sys-apps/busybox-1.4.1-r2/work
 * Applying bb.patch ...                                                                                                      [ ok ]
 * Applying selinux-link.patch ...                                                                                            [ ok ]
 * Applying bin2hex.patch ...                                                                                                 [ ok ]
 * Applying data_extract_all.patch ...                                                                                        [ ok ]
 * # CONFIG_DMALLOC is not set
 * # CONFIG_FEATURE_SUID_CONFIG is not set
 * # CONFIG_BUILD_AT_ONCE is not set
 * # CONFIG_BUILD_LIBBUSYBOX is not set
 * CONFIG_FEATURE_SH_IS_ASH=y
 * # CONFIG_FEATURE_SH_IS_NONE is not set
 * # CONFIG_STATIC is not set
 * # CONFIG_DEBUG is not set
 * # CONFIG_SELINUX is not set
 * # CONFIG_LOCALE_SUPPORT is not set
 * # CONFIG_TFTP is not set
 * # CONFIG_FTPGET is not set
 * # CONFIG_FTPPUT is not set
 * # CONFIG_IPCALC is not set
 * # CONFIG_TFTP is not set
 * # CONFIG_HUSH is not set
 * # CONFIG_LASH is not set
 * # CONFIG_MSH is not set
 * # CONFIG_INETD is not set
 * # CONFIG_DPKG is not set
 * # CONFIG_RPM2CPIO is not set
 * # CONFIG_RPM is not set
 * # CONFIG_FOLD is not set
 * # CONFIG_LOGNAME is not set
 * # CONFIG_OD is not set
 * # CONFIG_CRONTAB is not set
 * # CONFIG_UUDECODE is not set
 * # CONFIG_UUENCODE is not set
 * # CONFIG_SULOGIN is not set
 * # CONFIG_DC is not set
 * 
 * # CONFIG_DEBUG_INIT is not set
 * # CONFIG_DEBUG_CROND_OPTION is not set
 * # CONFIG_FEATURE_UDHCP_DEBUG is not set
 * # CONFIG_TASKSET is not set
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/sys-apps/busybox-1.4.1-r2/work/busybox-1.4.1 ...
  SPLIT   include/autoconf.h -> include/config/*
  GEN     include/bbconfigopts.h
  HOSTCC  applets/usage
  GEN     include/usage_compressed.h
  CC      applets/applets.o
  CC      applets/busybox.o
  LD      applets/built-in.o
  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

!!! ERROR: sys-apps/busybox-1.4.1-r2 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 3323:   Called src_compile
  busybox-1.4.1-r2.ebuild, line 183:   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-1.4.1-r2/temp/build.log'.