Due to outdated config.guess, the current dbus-c+= doesnt compile for ppc64le.  A trivial change to the bootstrap script which calls libtoolize fixes this.  Please consider the following patches:

[baude@localhost dbus-c++]$ git diff
diff --git a/dbus-c++.spec b/dbus-c++.spec
index 9706eb2..b604ff4 100644
--- a/dbus-c++.spec
+++ b/dbus-c++.spec
@@ -1,6 +1,6 @@
 Name:           dbus-c++
 Version:        0.9.0
-Release:        1%{?dist}
+Release:        1.1%{?dist}
 Summary:        Native C++ bindings for D-Bus
 
 Group:          System Environment/Libraries
@@ -10,6 +10,7 @@ Source0:        http://downloads.sourceforge.net/dbus-cplusplus/lib%{name}-%{ver
 
 Patch1: dbus-c++-gcc4.7.patch
 Patch2: dbus-c++-linkfix.patch
+Patch99: dbus_libtoolize.patch
 
 BuildRequires: dbus-devel
 BuildRequires: glib2-devel
@@ -37,6 +38,7 @@ developing applications that use %{name}.
 %{__sed} -i 's/\r//' AUTHORS
 %patch1 -p1 -b .gcc47
 %patch2 -p1 -b .linkfix
+%patch99 -p1
 
 %build
 ./autogen.sh


And patch99 is:
[baude@localhost dbus-c++]$ cat dbus_libtoolize.patch 
--- libdbus-c++-0.9.0/bootstrap.orig	2014-02-26 09:08:56.000000000 -0600
+++ libdbus-c++-0.9.0/bootstrap	2014-02-26 09:09:51.000000000 -0600
@@ -56,7 +56,7 @@
 fi
 
 echo "Running libtoolize..."
-libtoolize --force --copy
+libtoolize -if --copy
 
 aclocalinclude="$ACLOCAL_FLAGS -I m4"
 echo "Running aclocal $aclocalinclude ..."