--- libgcc/configure.orig
+++ libgcc/configure
@@ -5217,7 +5217,7 @@
 # check if we have VSX (ISA 2.06) support to build the software libraries, and
 # whether the assembler can handle xsaddqp for hardware support.  Also check if
 # a new glibc is being used so that __builtin_cpu_supports can be used.
-powerpc*-*-linux*)
+powerpc*-*-linux* | powerpc*-*-freebsd*)
   saved_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PowerPC ISA 2.06 to build __float128 libraries" >&5
@@ -5228,6 +5228,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 vector double dadd (vector double a, vector double b) { return a + b; }
+__ibm128 conftest_ibm128;
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   libgcc_cv_powerpc_float128=yes