I also would like to know. Its had that warning now for a good two years and sourceforge or the author has done anything about it and more importantly let "us" know what is going on, at least I've not found any additional information anywhere.
il_jp2.cpp:353:2: error: invalid conversion
Version 4.0.0 fails compile
Here is glew.h. Did not check all the ones it said were undefined but of the 6 or so I did, they were there; / The OpenGL Extension Wrangler Library Copyright (C) 2008-2017, Nigel Stewart <nigels[]users net="" sourceforge=""> Copyright (C) 2002-2008, Milan Ikits <milan org="" ikits[]ieee=""> </milan> Copyright (C) 2002-2008, Marcelo E. Magallon <mmagallo[]debian org=""> Copyright (C) 2002, Lev Povalahev All rights reserved. Redistribution and use in source and binary forms, with or without modification,...
I don't use that distro. Anyway. Here, glew installed this; /usr/include /usr/include/GL /usr/include/GL/glew.h /usr/include/GL/glxew.h /usr/include/GL/wglew.h /usr/lib /usr/lib64 /usr/lib64/libGLEW.a /usr/lib64/libGLEW.so /usr/lib64/libGLEW.so.2.1 /usr/lib64/libGLEW.so.2.1.0 /usr/lib/pkgconfig /usr/lib/pkgconfig/glew.pc And pkgconf shows; pkgconf --libs /usr/lib/pkgconfig/glew.pc -L/usr/lib64 -lGLEW -lGLU -lGL
OGL undefined references to glew.
LibRawLite fails build
Lunar-Linux (source distro) with gcc-7.2.0, glibc-2.27, binutils-2.30 and using all system dependencies.