Don't use git://.

doc/building.dox

@@ -188,7 +188,7 @@ directory. They allow you to build and install the package directly from the
 source tree. Example usage:
 
 @code{.sh}
-git clone git://github.com/mosra/magnum && cd magnum
+git clone https://github.com/mosra/magnum && cd magnum
 cd package/archlinux
 makepkg -fp PKGBUILD # or any other PKGBUILD file
 @endcode
@@ -227,7 +227,7 @@ the currently checked out source tree. Both depend on a corresponding
 @ref building-corrade-packages-msys "Corrade MSYS2 package". Example usage:
 
 @code{.sh}
-git clone git://github.com/mosra/magnum && cd magnum
+git clone https://github.com/mosra/magnum && cd magnum
 cd package/msys
 makepkg -fp PKGBUILD
 @endcode
@@ -257,7 +257,7 @@ Building is easy, just change directory to package root, link or copy
 `package/debian` directory there and run `dpkg-buildpackage`:
 
 @code{.sh}
-git clone git://github.com/mosra/magnum && cd magnum
+git clone https://github.com/mosra/magnum && cd magnum
 ln -s package/debian .
 dpkg-buildpackage --no-sign
 @endcode
@@ -286,7 +286,7 @@ Gentoo Git ebuild is available in the `package/gentoo` directory. Get the
 build and install Magnum like this:
 
 @code{.sh}
-git clone git://github.com/mosra/magnum && cd magnum
+git clone https://github.com/mosra/magnum && cd magnum
 cd package/gentoo
 sudo ebuild dev-libs/magnum/magnum-9999.ebuild manifest clean merge
 @endcode
@@ -339,7 +339,7 @@ repository with your favorite IDE or Git GUI, download currrent snapshot as a
 compressed archive or use the command line:
 
 @code{.sh}
-git clone git://github.com/mosra/magnum.git
+git clone https://github.com/mosra/magnum.git
 @endcode
 
 Relevant information about CMake usage is described in

doc/platforms-html5.dox

@@ -54,7 +54,7 @@ submodule to your project or fetch the contents any other way that suits your pr
 placed in a `toolchains/` subdirectory.
 
 @code{.sh}
-git submodule add git://github.com/mosra/toolchains
+git submodule add https://github.com/mosra/toolchains
 @endcode
 
 There are two toolchain files. The `generic/Emscripten.cmake` is for the

package/archlinux/magnum-git/PKGBUILD

@@ -10,7 +10,7 @@ depends=('corrade-git' 'openal' 'glfw' 'sdl2' 'vulkan-icd-loader')
 makedepends=('cmake' 'git' 'ninja')
 provides=('magnum')
 conflicts=('magnum')
-source=("git+git://github.com/mosra/magnum.git")
+source=("git+https://github.com/mosra/magnum.git")
 sha1sums=('SKIP')
 
 pkgver() {

package/debian/control

@@ -5,7 +5,7 @@ Build-Depends: debhelper (>= 9), cmake (>= 3.4), corrade-dev, libgl-dev, libopen
 Standards-Version: 3.9.2
 Section: libs
 Homepage: https://magnum.graphics
-Vcs-Git: git://github.com/mosra/magnum.git
+Vcs-Git: https://github.com/mosra/magnum.git
 Vcs-Browser: https://github.com/mosra/magnum
 
 Package: magnum-dev

package/gentoo/dev-libs/magnum/magnum-9999.ebuild

@@ -1,6 +1,6 @@
 EAPI=7
 
-EGIT_REPO_URI="git://github.com/mosra/magnum.git"
+EGIT_REPO_URI="https://github.com/mosra/magnum.git"
 
 inherit cmake git-r3
 

package/homebrew/magnum.rb

@@ -4,7 +4,7 @@ class Magnum < Formula
   url "https://github.com/mosra/magnum/archive/v2020.06.tar.gz"
   # wget https://github.com/mosra/magnum/archive/v2020.06.tar.gz -O - | sha256sum
   sha256 "98dfe802e56614e4e6bf750d9b693de46a5ed0c6eb479b0268f1a20bf34268bf"
-  head "git://github.com/mosra/magnum.git"
+  head "https://github.com/mosra/magnum.git"
 
   depends_on "cmake"
   depends_on "corrade"