Eric S Fraga <esflists@gmail.com> writes:

> On Friday, 28 Sep 2018 at 11:39, Christian Moe wrote:
>> Hi,
>>
>> I am trying to generate a PNG file with a TikZ picture from a LaTeX src
>> block, looking at instructions here:
>> https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-LaTeX.html
>>
>> I try this:
>>
>> #+header: :file "tikzpic.png" :fit yes :results raw file :exports results :headers '("\\usepackage{tikz}")
>> #+begin_src latex
>>   \begin{tikzpicture}
>>    \draw [fill=green] (0,4) -- (3,0) -- (-3,0) -- cycle;
>>   \end{tikzpicture}
>> #+end_src

It seems that the function `org-babel-execute:latex' ignores the
property :headers under certain circumstances. Therefore the line
"\usepackage{tikz}" will be missing in your resulting latex document.

The property is not ignored if you also append the property
":imagemagick t" to the #+header line. So you can use the following
header as a fix (for another fix, see below):

#+header: :file "tikzpic.png" :fit yes :results raw file :exports results :headers '("\\usepackage{tikz}") :imagemagick t

I've drafted a patch that fixes the issue. I would appreciate if some
maintainer could have a look and comment, or apply the patch: