--- zconf.h	2026-02-18 12:26:44.923467968 +0100
+++ zconf.h	2026-02-18 12:27:35.631302082 +0100
@@ -443,11 +443,11 @@
    typedef unsigned long z_crc_t;
 #endif

-#if HAVE_UNISTD_H-0     /* may be set to #if 1 by ./configure */
+#ifdef HAVE_UNISTD_H     /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_UNISTD_H
 #endif

-#if HAVE_STDARG_H-0     /* may be set to #if 1 by ./configure */
+#ifdef HAVE_STDARG_H     /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_STDARG_H
 #endif