Index: zlib-1.2.11/infback.c
===================================================================
--- zlib-1.2.11.orig/infback.c
+++ zlib-1.2.11/infback.c
@@ -34,9 +34,6 @@ int stream_size;
 {
     struct inflate_state FAR *state;
 
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
-        stream_size != (int)(sizeof(z_stream)))
-        return Z_VERSION_ERROR;
     if (strm == Z_NULL || window == Z_NULL ||
         windowBits < 8 || windowBits > 15)
         return Z_STREAM_ERROR;
Index: zlib-1.2.11/inflate.c
===================================================================
--- zlib-1.2.11.orig/inflate.c
+++ zlib-1.2.11/inflate.c
@@ -219,9 +219,6 @@ int stream_size;
     int ret;
     struct inflate_state FAR *state;
 
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
-        stream_size != (int)(sizeof(z_stream)))
-        return Z_VERSION_ERROR;
     if (strm == Z_NULL) return Z_STREAM_ERROR;
     strm->msg = Z_NULL;                 /* in case we return an error */
     if (strm->zalloc == (alloc_func)0) {
Index: zlib-1.2.11/deflate.c
===================================================================
--- zlib-1.2.11.orig/deflate.c
+++ zlib-1.2.11/deflate.c
@@ -263,17 +263,12 @@ int ZEXPORT deflateInit2_(strm, level, m
 {
     deflate_state *s;
     int wrap = 1;
-    static const char my_version[] = ZLIB_VERSION;
 
     ushf *overlay;
     /* We overlay pending_buf and d_buf+l_buf. This works since the average
      * output size for (length,distance) codes is <= 24 bits.
      */
 
-    if (version == Z_NULL || version[0] != my_version[0] ||
-        stream_size != sizeof(z_stream)) {
-        return Z_VERSION_ERROR;
-    }
     if (strm == Z_NULL) return Z_STREAM_ERROR;
 
     strm->msg = Z_NULL;