diff -rupN qtbase-everywhere-src-5.12.4/src/corelib/configure.json qtbase-everywhere-src-5.12.4-new/src/corelib/configure.json
--- qtbase-everywhere-src-5.12.4/src/corelib/configure.json	2019-06-12 22:59:14.000000000 +0200
+++ qtbase-everywhere-src-5.12.4-new/src/corelib/configure.json	2019-06-28 21:33:11.524155313 +0200
@@ -633,7 +633,7 @@
             "label": "GNU iconv",
             "enable": "input.iconv == 'gnu'",
             "disable": "input.iconv == 'posix' || input.iconv == 'sun' || input.iconv == 'no'",
-            "condition": "!config.win32 && !config.qnx && !config.android && !config.darwin && !features.posix-libiconv && !features.sun-libiconv && libs.gnu_iconv",
+            "condition": "!config.qnx && !config.android && !config.darwin && !features.posix-libiconv && !features.sun-libiconv && libs.gnu_iconv",
             "output": [ "privateFeature" ]
         },
         "icu": {