diff -ur zlib-1.2.8/CMakeLists.txt zlib-1.2.8.std_libname/CMakeLists.txt
--- zlib-1.2.8/CMakeLists.txt	2013-04-29 00:57:10.000000000 +0200
+++ zlib-1.2.8.std_libname/CMakeLists.txt	2017-02-07 11:56:21.826507000 +0100
@@ -205,6 +205,9 @@
    if(NOT APPLE)
      set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
    endif()
+elseif(MINGW)
+    # On unix-like platforms the library is almost always called libz
+   set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
 elseif(BUILD_SHARED_LIBS AND WIN32)
     # Creates zlib1.dll when building shared library version
     set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
Only in zlib-1.2.8: zconf.h
Only in zlib-1.2.8.std_libname: zconf.h.included