+%if %{with libunwind}
+# workaround for:
+# /usr/bin/ld: copy reloc against protected `_UPT_accessors' is invalid
+# /usr/bin/ld: failed to set dynamic section sizes: Bad value
+# (should be fixed in gcc >(=?) 5.1)
+CFLAGS="%{rpmcflags} -fPIE"
+%endif
+%configure \
+ %{!?with_libiberty:--without-libiberty} \
+ %{!?with_libunwind:--without-libunwind}