diff --git a/config.lib b/config.lib
--- a/config.lib
+++ b/config.lib
@@ -796,22 +796,22 @@ check_params() {
                log 1 "checking assert... disabled"
        fi
 
-       pre_detect_with_zlib=$with_zlib
-       detect_zlib
-
-       if [ "$with_zlib" = "0" ] || [ -z "$zlib-config" ]; then
-               log 1 "WARNING: zlib was not detected or disabled"
-               log 1 "WARNING: OpenTTD doesn't require zlib, but it does mean that many features"
-               log 1 "WARNING: (like loading most old savegames/scenarios, loading heightmaps,"
-               log 1 "WARNING: using PNG, or using fonts, ...) will be disabled."
-               if [ "$pre_detect_with_zlib" = "0" ]; then
-                       log 1 "WARNING: We strongly suggest you to install zlib."
-               else
-                       log 1 "configure: error: no zlib detected"
-                       log 1 " If you want to compile without zlib use --without-zlib as parameter"
-                       exit
-               fi
-       fi
+#      pre_detect_with_zlib=$with_zlib
+#      detect_zlib
+#
+#      if [ "$with_zlib" = "0" ] || [ -z "$zlib-config" ]; then
+#              log 1 "WARNING: zlib was not detected or disabled"
+#              log 1 "WARNING: OpenTTD doesn't require zlib, but it does mean that many features"
+#              log 1 "WARNING: (like loading most old savegames/scenarios, loading heightmaps,"
+#              log 1 "WARNING: using PNG, or using fonts, ...) will be disabled."
+#              if [ "$pre_detect_with_zlib" = "0" ]; then
+#                      log 1 "WARNING: We strongly suggest you to install zlib."
+#              else
+#                      log 1 "configure: error: no zlib detected"
+#                      log 1 " If you want to compile without zlib use --without-zlib as parameter"
+#                      exit
+#              fi
+#      fi
 
        pre_detect_with_lzma=$with_lzma
        detect_lzma
@@ -1667,12 +1667,13 @@ make_cflags_and_ldflags() {
 
        if [ "$with_zlib" != "0" ]; then
                CFLAGS="$CFLAGS -DWITH_ZLIB"
-               CFLAGS="$CFLAGS `$zlib_config --cflags | tr '\n\r' '  '`"
-               if [ "$enable_static" != "0" ]; then
-                       LIBS="$LIBS `$zlib_config --libs --static | tr '\n\r' '  '`"
-               else
-                       LIBS="$LIBS `$zlib_config --libs | tr '\n\r' '  '`"
-               fi
+               CFLAGS="$CFLAGS -I/path/to/mingw/zlib/include/dir"
+#              if [ "$enable_static" != "0" ]; then
+#                      LIBS="$LIBS `$zlib_config --libs --static | tr '\n\r' '  '`"
+#              else
+#                      LIBS="$LIBS `$zlib_config --libs | tr '\n\r' '  '`"
+#              fi
+               LIBS="$LIBS -L/path/to/mingw/zlib/lib/dir -lz"  # includes /path/to/mingw/zlib/lib/dir/libz.<something>
        fi
 
        if [ -n "$lzma_config" ]; then