Add nettle component.

component/nettle/buildout.cfg

+[buildout]
+extends = ../gmp/buildout.cfg
+
+[nettle-lib-location.patch]
+recipe = hexagonit.recipe.download
+download-only = true
+filename = ${:_buildout_section_name_}
+url = ${:_profile_base_location_}/${:filename}
+md5sum = 41dd0ce2a73487929bdc637b75dd62c9
+
+[nettle]
+recipe = slapos.recipe.cmmi
+url = http://www.lysator.liu.se/~nisse/archive/nettle-2.7.1.tar.gz
+md5sum = 003d5147911317931dd453520eb234a5
+patches =
+  ${nettle-lib-location.patch:location}/${nettle-lib-location.patch:filename}
+configure-option =
+  --disable-static
+  --disable-assembler
+  --disable-openssl
+environment =
+  CPPFLAGS=-I${gmp:location}/include
+  LDFLAGS=-L${gmp:location}/lib -Wl,-rpath=${gmp:location}/lib

component/nettle/nettle-lib-location.patch

+--- configure.orig	2013-07-05 15:37:28.000000000 +0200
++++ configure	2013-07-05 15:47:48.000000000 +0200
+@@ -4680,52 +4680,6 @@
+ if test "x$ABI" != xstandard ; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: Compiler uses $ABI-bit ABI. To change, set CC." >&5
+ $as_echo "$as_me: Compiler uses $ABI-bit ABI. To change, set CC." >&6;}
+-  if test "$libdir" = '${exec_prefix}/lib' ; then
+-    # Try setting a better default
+-    case "$host_cpu:$host_os:$ABI" in
+-      *:solaris*:32|*:sunos*:32)
+-	libdir='${exec_prefix}/lib'
+-	;;
+-      *:solaris*:64|*:sunos*:64)
+-	libdir='${exec_prefix}/lib/64'
+-	;;
+-      # Linux conventions are a mess... According to the Linux File
+-      # Hierarchy Standard, all architectures except IA64 puts 32-bit
+-      # libraries in lib, and 64-bit in lib64. Some distributions,
+-      # e.g., Fedora and Gentoo, adhere to this standard, while at
+-      # least Debian has decided to put 64-bit libraries in lib and
+-      # 32-bit libraries in lib32.
+-
+-      # We try to figure out the convention, except if we're cross
+-      # compiling. We use lib${ABI} if /usr/lib${ABI} exists and
+-      # appears to not be a symlink to a different name.
+-      *:linux*:32|*:linux*:64)
+-	if test "$cross_compiling" = yes ; then
+-          { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Cross compiling for linux. Can't guess if libraries go in lib${ABI} or lib." >&5
+-$as_echo "$as_me: WARNING: Cross compiling for linux. Can't guess if libraries go in lib${ABI} or lib." >&2;}; 	else
+-	  # The dash builtin pwd tries to be "helpful" and remember
+-	  # symlink names. Use -P option, and hope it's portable enough.
+-	  test -d /usr/lib${ABI} \
+-	    && (cd /usr/lib${ABI} && pwd -P | grep >/dev/null "/lib${ABI}"'$') \
+-	    && libdir='${exec_prefix}/'"lib${ABI}"
+-	fi
+-	;;
+-      # On freebsd, it seems 32-bit libraries are in lib32,
+-      # and 64-bit in lib. Don't know about "kfreebsd", does
+-      # it follow the Linux fhs conventions?
+-      *:freebsd*:32)
+-	libdir='${exec_prefix}/lib32'
+-	;;
+-      *:freebsd*:64)
+-	libdir='${exec_prefix}/lib'
+-	;;
+-      *)
+-        { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Don't know where to install $ABI-bit libraries on this system." >&5
+-$as_echo "$as_me: WARNING: Don't know where to install $ABI-bit libraries on this system." >&2;};
+-    esac
+-    { $as_echo "$as_me:${as_lineno-$LINENO}: Libraries to be installed in $libdir." >&5
+-$as_echo "$as_me: Libraries to be installed in $libdir." >&6;}
+-  fi
+ fi
+ 
+ # Select assembler code