build error in current master
```
creating build/lib.linux-x86_64-2.6/pandas/tseries/tests/data
copying pandas/tseries/tests/data/series.pickle -> build/lib.linux-x86_64-2.6/pandas/tseries/tests/data
copying pandas/tseries/tests/data/frame.pickle -> build/lib.linux-x86_64-2.6/pandas/tseries/tests/data
running build_ext
cythoning pandas/src/tseries.pyx to pandas/src/tseries.c

Error compiling Cython file:
------------------------------------------------------------
...

from numpy cimport int32_t, int64_t, import_array, ndarray
from cpython cimport *

from libc.stdlib cimport malloc, free, abs
from libc.math cimport floor
^
------------------------------------------------------------

pandas/pandas_test/pandas/src/datetime.pyx:10:0: 'floor.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...

from numpy cimport int32_t, int64_t, import_array, ndarray
from cpython cimport *

from libc.stdlib cimport malloc, free, abs
from libc.math cimport floor
                      ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/datetime.pyx:10:23: Name 'floor' not declared in module 'libc.math'


Error compiling Cython file:
------------------------------------------------------------
...

def roll_median_c(ndarray[float64_t] arg, int win, int minp):
    cdef double val, res, prev
    cdef:
        int ret=0
        skiplist_t *sl
       ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:448:8: 'skiplist_t' is not a type identifier

Error compiling Cython file:
------------------------------------------------------------
...


    cdef Py_ssize_t N = len(arg)
    cdef ndarray[double_t] output = np.empty(N, dtype=float)

    sl = skiplist_init(win)
                     ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:455:22: undeclared name not builtin: skiplist_init

Error compiling Cython file:
------------------------------------------------------------
...
        val = arg[i]

        # Not NaN
        if val == val:
            nobs += 1
            skiplist_insert(sl, val)
                          ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:465:27: undeclared name not builtin: skiplist_insert

Error compiling Cython file:
------------------------------------------------------------
...

        if i > win - 1:
            prev = arg[i - win]

            if prev == prev:
                skiplist_remove(sl, prev)
                              ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:476:31: undeclared name not builtin: skiplist_remove

Error compiling Cython file:
------------------------------------------------------------
...
                skiplist_remove(sl, prev)
                nobs -= 1

        if val == val:
            nobs += 1
            skiplist_insert(sl, val)
                          ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:481:27: undeclared name not builtin: skiplist_insert

Error compiling Cython file:
------------------------------------------------------------
...
            skiplist_insert(sl, val)

        if nobs >= minp:
            midpoint = nobs / 2
            if nobs % 2:
                res = skiplist_get(sl, midpoint, &ret)
                                 ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:486:34: undeclared name not builtin: skiplist_get

Error compiling Cython file:
------------------------------------------------------------
...
        if nobs >= minp:
            midpoint = nobs / 2
            if nobs % 2:
                res = skiplist_get(sl, midpoint, &ret)
            else:
                res = (skiplist_get(sl, midpoint, &ret) +
                                  ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:488:35: undeclared name not builtin: skiplist_get

Error compiling Cython file:
------------------------------------------------------------
...
            midpoint = nobs / 2
            if nobs % 2:
                res = skiplist_get(sl, midpoint, &ret)
            else:
                res = (skiplist_get(sl, midpoint, &ret) +
                       skiplist_get(sl, (midpoint - 1), &ret)) / 2
                                  ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:489:35: undeclared name not builtin: skiplist_get

Error compiling Cython file:
------------------------------------------------------------
...
        else:
            res = NaN

        output[i] = res

    skiplist_destroy(sl)
                   ^
------------------------------------------------------------

pandas/pandas_test/pandas/src/moments.pyx:495:20: undeclared name not builtin: skiplist_destroy
building 'pandas._tseries' extension
creating build/temp.linux-x86_64-2.6
creating build/temp.linux-x86_64-2.6/pandas
creating build/temp.linux-x86_64-2.6/pandas/src
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -O2 -fPIC -I/usr/lib/pymodules/python2.6/numpy/core/include -I/usr/include/python2.6 -c pandas/src/tseries.c -o build/temp.linux-x86_64-2.6/pandas/src/tseries.o
pandas/src/tseries.c:1:2: Fehler: #error Do not use this file, it is the result of a failed Cython compilation.
error: command 'gcc' failed with exit status 1
make[1]: *** [python-install2.6] Fehler 1
make[1]: Verlasse Verzeichnis 'pandas/pandas_test'
make: *** [binary] Fehler 2
dpkg-buildpackage: Fehler: Fehler-Exitstatus von fakeroot debian/rules binary war 2

```
