File setup.py of Package failed_python-pyFFTW

```python
from setuptools import setup, Extension
from Cython.Build import cythonize
import numpy as np

# Disable OpenMP support if FFTW OpenMP libraries are unavailable
fftw_libraries = ['fftw3', 'fftw3_threads']
fftwf_libraries = ['fftw3f', 'fftw3f_threads']
fftwl_libraries = ['fftw3l', 'fftw3l_threads']

# Define extensions
extensions = [
    Extension(
        "pyfftw.pyfftw",
        sources=["pyfftw/pyfftw.pyx"],
        include_dirs=[np.get_include(), "include"],
        libraries=fftw_libraries + fftwf_libraries + fftwl_libraries,
        extra_compile_args=['-O2', '-Wall'],
        extra_link_args=[],
    )
]

setup(
    name="pyFFTW",
    version="0.14.0",
    ext_modules=cythonize(extensions),
)
```

---

### Explanation of Changes

1. **`pyfftw/pyfftw.pxd`**:
   - Defines FFTW-compatible complex number structures (`fftw_complex`, `fftwf_complex`, `fftwl_complex`) to ensure compatibility with FFTW's API.

2. **`pyfftw/utils.pxi`**:
   - Replaces custom complex number definitions with FFTW-compatible ones.
   - Adds utility functions (`to_fftw_complex`, etc.) to convert Python complex numbers to FFTW-compatible types.

3. **`setup.py`**:
   - Removes OpenMP-related libraries (`fftw3_omp`, etc.) from the build configuration to avoid linker errors.
   - Ensures only the basic FFTW libraries (`fftw3`, `fftw3_threads`, etc.) are linked.

---

### Additional Notes

- If FFTW OpenMP libraries are required, ensure the correct development package is installed (e.g., `fftw-devel-openmp`).
- The changes above assume that OpenMP support is not critical for the build. If OpenMP is required, the build environment must be updated to include the necessary libraries.

These modifications should resolve the build errors and allow the package to compile successfully.