Undefined symbols

[astrojuanlu]

Even if the extension builds, there are some remaning undefined symbols:

$ nm cephes.cpython-35m-x86_64-linux-gnu.so | grep " U "
                 U acos
                 U asin
                 U atan
                 U cos
                 U cosh
                 U exp
                 U floor
                 U frexp@@GLIBC_2.2.5
                 U isfinite
                 U ldexp@@GLIBC_2.2.5
                 U log
                 U p1evl
                 U polevl
                 U pow
                 U printf@@GLIBC_2.2.5
                 U sin
                 U sinh
                 U sqrt
                 U tan
                 U tanh