diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index dcd96ed54..3c87efa09 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -903,7 +903,15 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           #
           dnl Only clang 3.2 or later
           if test "$compiler_num" -ge "302"; then
-            tmp_CFLAGS="$tmp_CFLAGS -Wmissing-variable-declarations"
+            case $host_os in
+            cygwin* | mingw*)
+              dnl skip missing-variable-declarations warnings for cygwin and
+              dnl mingw because the libtool wrapper executable causes them
+              ;;
+            *)
+              tmp_CFLAGS="$tmp_CFLAGS -Wmissing-variable-declarations"
+              ;;
+            esac
           fi
           #
           dnl Only clang 3.6 or later