So, I may have missed the update for config.h.in. I am not sure this gets autogenerated or not.
--- config.h.in.orig 2017-02-18 13:27:19.000000000 -0800 +++ config.h.in 2017-02-18 13:27:45.000000000 -0800 @@ -2183,6 +2183,9 @@ /* Define to 1 if you have the `sincos' function. */ #undef HAVE_SINCOS +/* Define to 1 if you have the `__sincos' function. */ +#undef HAVE___SINCOS + /* Define to 1 if you have the `snprintf' function. */ #undef HAVE_SNPRINTF
