--- ../../upstream/zconf.h.in	2020-01-06 18:33:14.847145532 +0300
+++ zconf.h.in	2020-01-20 21:22:20.133238249 +0300
@@ -431,11 +431,11 @@ typedef uLong FAR uLongf;
    typedef unsigned long z_crc_t;
 #endif
 
-#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#if @HAVE_UNISTD_H@    /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_UNISTD_H
 #endif
 
-#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
+#if @HAVE_STDARG_H@    /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_STDARG_H
 #endif