Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.

import pymupdf


def test_4520():
    """Accept source pages without /Contents object in show_pdf_page."""
    tar = pymupdf.open()
    src = pymupdf.open()
    src.new_page()
    page = tar.new_page()
    xref = page.show_pdf_page(page.rect, src, 0)
    assert xref