title: cross-NG GCC 4.6.3 configure failure: unable to find a usable PPL (while it's present)
body: <p>I'm trying to build cross-NG for ARM and i586 architectures. <code>ct-ng build</code> fails when trying to compile GCC. I already installed PPL version 1.0-1. Also tried version 0.11.2-2. I can'r understand why configuration script of GCC can't find PPL, while is already there... </p>
  
  <p>All same result:</p>
  
  <pre><code>...
  [CFG  ]    checking for the correct version of gmp.h... yes
  [CFG  ]    checking for the correct version of mpfr.h... yes
  [CFG  ]    checking for the correct version of mpc.h... yes
  [CFG  ]    checking for the correct version of the gmp/mpfr/mpc libraries... yes
  [CFG  ]    checking for PWL_handle_timeout in -lpwl... yes
  [CFG  ]    checking for version 0.11 (revision 0 or later) of PPL... no
  [ERROR]    configure: error: Unable to find a usable PPL.  See config.log for details.
  [ERROR]  
  [ERROR]  &gt;&gt;
  [ERROR]  &gt;&gt;  Build failed in step 'Installing pass-1 core C compiler'
  [ERROR]  &gt;&gt;        called in step '(top-level)'
  [ERROR]  &gt;&gt;
  [ERROR]  &gt;&gt;  Error happened in: CT_DoExecLog[scripts/functions@172]
  [ERROR]  &gt;&gt;        called from: do_cc_core_backend[scripts/build/cc/gcc.sh@343]
  [ERROR]  &gt;&gt;        called from: do_cc_core_pass_1[scripts/build/cc/gcc.sh@88]
  [ERROR]  &gt;&gt;        called from: main[scripts/crosstool-NG.sh@598]
  [ERROR]  &gt;&gt;
  [ERROR]  &gt;&gt;  For more info on this error, look at the file: 'build.log'
  [ERROR]  &gt;&gt;  There is a list of known issues, some with workarounds, in:
  [ERROR]  &gt;&gt;      'docs/B - Known issues.txt'
  [ERROR]  
  [ERROR]  (elapsed: 7:27.12)
  </code></pre>
  
  <p>In case that matters, my box:</p>
  
  <pre><code>uname -m x86_64
  distro: archlinux
  gcc -v: gcc version 4.7.1 20120721 (prerelease) (GCC)
  </code></pre>