png.h file not found about pdftojson

[harry1080]

./configure --with-libpng-library=/usr/local/Cellar/libpng/1.6.16/lib/ --with-libpng-includes=/usr/local/Cellar/libpng/1.6.16/include/ --with-freetype2-library=/usr/local/lib/ --with-freetype2-includes=/usr/local/include/freetype2/

I am using ubuntu. The specific model is as follows:

Linux 5.15.0-97-generic #107~20.04.1-Ubuntu SMP Fri Feb 9 14:20:11 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Based on your answer, I guessed that I was missing libpng, so I followed apt install libpng-dev

it succeeded. Thank you for your reply. I wish you a happy day.You can close this question.

[ldenoue]

I think you get this file when you ./configure make.

[harry1080]

I think you get this file when you ./configure make.

I directly git clone from github to the local area, and then run ./configure, and the following error message appears, and then I cannot make.

And I didn’t see the file png.h in this warehouse. I saw many places referencing this header file, but I couldn’t find this file.

[ldenoue]

Are you on a Mac by chance?
You need to install libpng separately and configure with extra parameters, as specified in the README.
./configure --with-libpng-library=/usr/local/Cellar/libpng/1.6.16/lib/ --with-libpng-includes=/usr/local/Cellar/libpng/1.6.16/include/ --with-freetype2-library=/usr/local/lib/ --with-freetype2-includes=/usr/local/include/freetype2/

[ldenoue]

@harry1080 it would be useful for other if you could share your .configure parameters after you installed libpng.
I would update the README.md file.