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Dependencies such as cURL and OpenSSL are necessary to build and run Git. Previously, we obtained those dependencies by fetching NuGet packages. However, it is notoriously hard to keep NuGet packages of C/C++ libraries up-to-date, as the toolsets for different Visual Studio versions are different, and the NuGet packages would have to ship them all. That is the reason why the NuGet packages we use are quite old, and even insecure in the case of cURL and OpenSSL (the versions contain known security flaws that have been addressed by later versions for which no NuGet packages are available). The better way to handle this situation is to use the vcpkg system: https://github.com/Microsoft/vcpkg The idea is that a single Git repository contains enough supporting files to build up-to-date versions of a large number of Open Source libraries on demand, including cURL and OpenSSL. We integrate this system via four new .bat files to 1) initialize the vcpkg system, 2) build the packages, 4) set up Git's Makefile system to find the build artifacts, and 3) copy the artifacts into the top-level directory We now also completely convert the pathname exported in the %msvc_bin_dir_msys% variable to MSYS format with forward slashes rather than a mixture of forward and back slashes. This solves an obscure problem observed by some developers: [...] http-push.c CC remote-curl.o remote-curl.c * new script parameters GEN git-instaweb sed: -e expression #7, char 155: invalid reference \2 on `s' command's RHS make: *** [Makefile:2023: git-instaweb] Error 1 Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>