Without that fix we have that in the configure log:
  checking whether the Boost::Signals library is available... yes
  checking for main in -lboost_signals-mt... no
  checking for main in -lboost_signals-boost_signals-mt... no
But looking at config.log reveal something more problematic:
  configure:17760: checking for main in -lboost_signals-mt
  configure:17779: arm-angstrom-linux-gnueabi-g++ [...] -o conftest [...] -I/usr/include [...] -L/usr/lib conftest.cpp -lboost_signals-mt   >&5
  /usr/lib/libboost_signals-mt.so: file not recognized: File format not recognized
Wich is fixed by this commit.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
 DEFAULT_PREFERENCE_angstrom = "1"
 
 PV = "3.3.1+git"
-PR = "r6+gitr${SRCREV}"
+PR = "r7+gitr${SRCREV}"
 SRCREV = "7c669dd4ce69296f09004f8876366058c20a3352"
 
 inherit gnome
   --enable-gstreamer \
   --disable-gdu \
   --disable-scrollkeeper  \
-  --with-boost-signals=boost_signals-mt \
+  --with-boost=${STAGING_DIR} \
+  --with-boost-signals=boost_signals \
 "
 
 do_configure_prepend() {