I tried to make a build using the Makefile and configure.ac made by realvi (manuvi): https://github.com/manuvi/cinelerra/tree/master/cinelerra-5.1 I replaced the "Makefile" in .../cinelerra-5.1/cinelerra/Makefile the "configure.ac" in .../cinelerra-5.1/configure.ac the "Makefile" (thirdparty) in .../cinelerra-5.1/thirdparty/Makefile the "downloads.txt" in .../cinelerra-5.1/thirdparty/downloads.txt and add "libdpx.tar.xz" in .../cinelerra-5.1/thirdparty/src/libdpx.tar.xz [In configure.ac I have seen many changes of "AS_" to "AC_" and also the replacement of "ilmbase" with "imath"] The compile fails and exit. Would you be able to make these changes work, that update the OpenEXR and DPX libraries, as well as introducing the rendering of DPX sequences with CinGG's internal engine? I attach the "cin5.log", "Makefile", "Makefile(thirdparty), "downloads.txt", "libdpx.tar.xz" and "configure.ac" taken from the manuvi git.