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When I try to build SDL2_image on Ubuntu 16.04 I get these errors:

./.libs/libSDL2_image.so: undefined reference to `sio_getpar'
./.libs/libSDL2_image.so: undefined reference to `sio_write'
./.libs/libSDL2_image.so: undefined reference to `sio_setpar'
./.libs/libSDL2_image.so: undefined reference to `sio_close'
./.libs/libSDL2_image.so: undefined reference to `sio_read'
./.libs/libSDL2_image.so: undefined reference to `sio_initpar'
./.libs/libSDL2_image.so: undefined reference to `sio_stop'
./.libs/libSDL2_image.so: undefined reference to `sio_open'
./.libs/libSDL2_image.so: undefined reference to `sio_start'

Looks like it detects that I have libsndio-dev installed the -lsndio flag is not supplied

Well it tells me to contact the author, since I'm trying to build on Windows.

Is windows support coming?

I see that the sdl2_image build procedure is pretty static.

So one clean way would be to add cmake/gn/gyp whatever support to SDL2_image or patch it using conan.
If you need building yourself (which you definitely do at least for non-C libs. I know you know) one could:

1. upgrade the project (if newer than VS 2008)
2. replace the same stuff in the .vcxproj file (as you do in your build_with_make function
3. replace some more stuff since there is a VisualC/external folder containing includes..
4. build using the cli

Im probably telling you nothing new here.

P.S: Interchanging "Windows built" with Visual Studio is not fully correct ofc. MinGW support would require less headache, but some posix commands (namely the chmods) would need to go into if conditions