There’s not a lot I can suggest over and above the prompt provided by configure:
MRtrix3 was unable to compile a test program involving zlib.
Set the ZLIB_CFLAGS environment variable to inform 'configure' of
the flags it must provide to the compiler in order to compile
programs that use zlib functionality; this may include the path to
the zlib include files, as well as any required flags.
For example:
$ export ZLIB_CFLAGS="-isystem /usr/local/include"
$./configure
(amend with the actual path to the zlib include files on your system)So if you found a candidate file in msys64/mingw64/include, you would try:
$ export ZLIB_CFLAGS="-isystem /mingw64/include"
$./configure(since ‘msys64/’ will be the root directory within the MSYS2 file system)