Very old versions of libz (such as the one that comes with Solaris 10) don't have gzclearerr(). Check for that function and only use it if we have it.

svn path=/trunk/; revision=34187

configure.in

@@ -1157,6 +1157,12 @@ else
 	fi
 fi
 
+if test "x$want_zlib" != "xno" ; then
+	AC_CHECK_LIB(z, gzclearerr,
+	[
+		AC_DEFINE(HAVE_GZCLEARERR, 1, [Define if we have gzclearerr])
+	])
+fi
 
 dnl pcre check
 AC_MSG_CHECKING(whether to use libpcre for regular expressions in dfilters)

wiretap/wtap.c

@@ -648,10 +648,12 @@ wtap_close(wtap *wth)
 void
 wtap_cleareof(wtap *wth _U_) {
 #ifdef HAVE_LIBZ
+#ifdef HAVE_GZCLEARERR
 	/* Reset EOF */
 	if (gzeof(wth->fh))
 		gzclearerr(wth->fh);
 #endif
+#endif
 }
 
 gboolean