diff -r 36aa2ae92c29 -r 33f265e3e79d scripts/build/cc/gcc.sh
--- a/scripts/build/cc/gcc.sh	Sun Nov 25 18:22:38 2012 +0100
+++ b/scripts/build/cc/gcc.sh	Thu May 02 23:31:33 2013 +0000
@@ -409,6 +409,11 @@
             CT_DoExecLog CFG make ${JOBSFLAGS} configure-libdecnumber
             CT_DoExecLog ALL make ${JOBSFLAGS} -C libdecnumber libdecnumber.a
         fi
+        # HACK: gcc-4.8 uses libbacktrace to make libgcc.mvars, so make it here.
+        if [ -d "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/libbacktrace" ]; then
+            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libbacktrace
+            CT_DoExecLog ALL make ${JOBSFLAGS} -C libbacktrace
+        fi
 
         # Starting with GCC 4.3, libgcc.mk is no longer built,
         # and libgcc.mvars is used instead.