Hi,
1.6.0 should have that target, but support for visual studio prior to
2010 was removed afterward [1] to remove some workarounds [2][3]. You
can restore those locally and the master branch may still build.
[1] 078dff7 configure: remove old visual studio support (<2010)
[2] 0a64929 tests: remove redundant round() definition
[3] c125f4a remove visual studio < 2010 workarounds