diff -r 8a72662f0815 -r 1c68438f44f7 scripts/build/companion_libs/110-mpfr.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/build/companion_libs/110-mpfr.sh	Fri Nov 16 14:59:27 2012 +0100
@@ -0,0 +1,152 @@
+# This file adds the functions to build the MPFR library
+# Copyright 2008 Yann E. MORIN
+# Licensed under the GPL v2. See COPYING in the root of this package
+
+do_mpfr_get() { :; }
+do_mpfr_extract() { :; }
+do_mpfr_for_build() { :; }
+do_mpfr_for_host() { :; }
+
+# Overide function depending on configuration
+if [ "${CT_MPFR}" = "y" ]; then
+
+# Download MPFR
+do_mpfr_get() {
+    CT_GetFile "mpfr-${CT_MPFR_VERSION}" http://www.mpfr.org/mpfr-current/  \
+                                 http://www.mpfr.org/mpfr-${CT_MPFR_VERSION}/
+}
+
+# Extract MPFR
+do_mpfr_extract() {
+    CT_Extract "mpfr-${CT_MPFR_VERSION}"
+    CT_Patch "mpfr" "${CT_MPFR_VERSION}"
+
+    # OK, Gentoo have a sanity check that libtool.m4 and ltmain.sh have the
+    # same version number. Unfortunately, some tarballs of MPFR are not
+    # built sanely, and thus ./configure fails on Gentoo.
+    # See: http://sourceware.org/ml/crossgcc/2008-05/msg00080.html
+    # and: http://sourceware.org/ml/crossgcc/2008-06/msg00005.html
+    # This hack is not bad per se, but the MPFR guys would be better not to
+    # do that in the future...
+    # It seems that MPFR >= 2.4.0 do not need this...
+    case "${CT_MPFR_VERSION}" in
+        2.4.*)
+            CT_Pushd "${CT_SRC_DIR}/mpfr-${CT_MPFR_VERSION}"
+            if [ ! -f .autoreconf.ct-ng ]; then
+                CT_DoLog DEBUG "Running autoreconf"
+                CT_DoExecLog ALL autoreconf
+                touch .autoreconf.ct-ng
+            fi
+            CT_Popd
+            ;;
+        1.*|2.0.*|2.1.*|2.2.*|2.3.*)
+            CT_Pushd "${CT_SRC_DIR}/mpfr-${CT_MPFR_VERSION}"
+            if [ ! -f .autotools.ct-ng ]; then
+                CT_DoLog DEBUG "Re-building autotools files"
+                CT_DoExecLog ALL autoreconf -fi
+                # Starting with libtool-1.9f, config.{guess,sub} are no longer
+                # installed without -i, but starting with libtool-2.2.6, they
+                # are no longer removed without -i. Sight... Just use -i with
+                # libtool >=2
+                # See: http://sourceware.org/ml/crossgcc/2008-11/msg00046.html
+                # and: http://sourceware.org/ml/crossgcc/2008-11/msg00048.html
+                libtoolize_opt=
+                case "$(libtoolize --version |head -n 1 |awk '{ print $(NF); }')" in
+                    0.*)    ;;
+                    1.*)    ;;
+                    *)      libtoolize_opt=-i;;
+                esac
+                CT_DoExecLog ALL libtoolize -f ${libtoolize_opt}
+                touch .autotools.ct-ng
+            fi
+            CT_Popd
+            ;;
+    esac
+}
+
+# Build MPFR for running on build
+# - always build statically
+# - we do not have build-specific CFLAGS
+# - install in build-tools prefix
+do_mpfr_for_build() {
+    local -a mpfr_opts
+
+    case "${CT_TOOLCHAIN_TYPE}" in
+        native|cross)   return 0;;
+    esac
+
+    CT_DoStep INFO "Installing MPFR for build"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-mpfr-build-${CT_BUILD}"
+
+    mpfr_opts+=( "host=${CT_BUILD}" )
+    mpfr_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    do_mpfr_backend "${mpfr_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Build MPFR for running on host
+do_mpfr_for_host() {
+    local -a mpfr_opts
+
+    CT_DoStep INFO "Installing MPFR for host"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-mpfr-host-${CT_HOST}"
+
+    mpfr_opts+=( "host=${CT_HOST}" )
+    mpfr_opts+=( "prefix=${CT_HOST_COMPLIBS_DIR}" )
+    mpfr_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
+    do_mpfr_backend "${mpfr_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Build MPFR
+#     Parameter     : description               : type      : default
+#     host          : machine to run on         : tuple     : (none)
+#     prefix        : prefix to install into    : dir       : (none)
+#     cflags        : host cflags to use        : string    : (empty)
+do_mpfr_backend() {
+    local host
+    local prefix
+    local cflags
+    local arg
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    # Under Cygwin, we can't build a thread-safe library
+    case "${CT_HOST}" in
+        *cygwin*)   mpfr_opts+=( --disable-thread-safe );;
+        *mingw*)    mpfr_opts+=( --disable-thread-safe );;
+        *darwin*)   mpfr_opts+=( --disable-thread-safe );;
+        *)          mpfr_opts+=( --enable-thread-safe  );;
+    esac
+
+    CT_DoLog EXTRA "Configuring MPFR"
+    CT_DoExecLog CFG                                    \
+    CC="${host}-gcc"                                    \
+    CFLAGS="${CT_CFLAGS_FOR_HOST}"                      \
+    "${CT_SRC_DIR}/mpfr-${CT_MPFR_VERSION}/configure"   \
+        --build=${CT_BUILD}                             \
+        --host=${host}                                  \
+        --prefix="${prefix}"                            \
+        --with-gmp="${prefix}"                          \
+        --disable-shared                                \
+        --enable-static
+
+    CT_DoLog EXTRA "Building MPFR"
+    CT_DoExecLog ALL make ${JOBSFLAGS}
+
+    if [ "${CT_COMPLIBS_CHECK}" = "y" ]; then
+        CT_DoLog EXTRA "Checking MPFR"
+        CT_DoExecLog ALL make ${JOBSFLAGS} -s check
+    fi
+
+    CT_DoLog EXTRA "Installing MPFR"
+    CT_DoExecLog ALL make install
+}
+
+fi # CT_MPFR