Forward boost LD_FLAGS

This fixes #554 and #555

configure.ac

@@ -175,7 +175,7 @@ if test "$BOOST_THREAD_LIB" = ""; then
    AC_MSG_ERROR([No usable boost::thread found])
 fi
 
-[BOOST_LIBS="${BOOST_IOSTREAMS_LIB} -l${BOOST_PYTHON_LIB} ${BOOST_REGEX_LIB} ${BOOST_CONTEXT_LIB} ${BOOST_COROUTINE_LIB}"]
+[BOOST_LIBS="${BOOST_LDFLAGS} ${BOOST_IOSTREAMS_LIB} -l${BOOST_PYTHON_LIB} ${BOOST_REGEX_LIB} ${BOOST_CONTEXT_LIB} ${BOOST_COROUTINE_LIB}"]
 
 dnl GNU MP library (needed by CGAL)
 AC_CHECK_LIB(gmp, __gmpz_init, ,

m4/ax_lib_cgal_core.m4

@@ -65,7 +65,7 @@ for ac_cgal_iterate in $ac_cgal_dirs ; do
                 CGAL_LDFLAGS="-L$ac_cgal_iterate/lib -lCGAL -lCGAL_Core -lgmp ${BOOST_THREAD_LIB}"
             fi
             LDFLAGS_SAVED="$LDFLAGS"
-            LDFLAGS="$LDFLAGS $CGAL_LDFLAGS"
+            LDFLAGS="$LDFLAGS $BOOST_LDFLAGS $CGAL_LDFLAGS"
             export LDFLAGS
 
             AC_MSG_CHECKING([whether CGAL is available in $ac_cgal_iterate])