Disable all image I/O except for PNM files? about leptonica HOT 8 OPEN

For leptonica, a simple way to make your "headless" build is to edit only environ.h and use the static makefile, as described in the README.html.

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I plan to adjust cmake configuration, so you can choose which dependencies should be compiled.

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At the moment you can disable only webp (with -DLIBWEBP_SUPPORT=OFF) and openjpeg (-DOPENJPEG_SUPPORT=OFF).

Just for notice: jpeg is (optional) dependency for tiff, so error could come also from this source especially if you are making static build.

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I eventually managed to disable everything by editing the source code, especially environ.h and the Makefile (to get rid of all mentions of libjpeg, etc.). The resulting library was about 4MB for leptonica and 3MB for tesseract. It would be great if the Makefile could be edited so that it's easier to create a "headless" build.

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@DanBloomberg Yeah I found it, but I'm just suggesting making those environ.h flags configurable from the Makefile, so that it's easier to enable / disable without using sed (when using automated scripts / CI, etc.).

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@zdenop I also had to modify cmake/Configure.cmake and prog/makefile.static to completely disable linking to libpng, libtiff, libjpeg and libz: https://github.com/fschutt/tesseract-static-rs/blob/e5fffdf9fc1f5592d304ceab1237f8051535994b/build.rs#L123-L199

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As you demonstrate, in addition to editing environ.h, you also need to modify the ALL_LIBS variable in prog/makefile.static.
Nice use of rust!

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please try with current master:
cmake -Bbuild -DBUILD_PROG=OFF -DSW_BUILD=OFF -DBUILD_SHARED_LIBS=ON -DENABLE_ZLIB=OFF -DENABLE_PNG=OFF -DENABLE_GIF=OFF -DENABLE_JPEG=OFF -DENABLE_TIFF=OFF -DENABLE_WEBP=OFF -DENABLE_OPENJPEG=OFF

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