1 files changed, 7 insertions, 1 deletions

diff --git a/zconf.h.in b/zconf.h.in
index d3eaf91..1988920 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -368,7 +368,7 @@ typedef uLong FAR uLongf;
 #  include <sys/types.h>    /* for off_t */
 #endif
 
-#if defined(Z_HAVE_UNISTD_H) || _LARGEFILE64_SOURCE
+#if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
 #  include <unistd.h>       /* for SEEK_* and off_t */
 #  ifdef VMS
 #    include <unixio.h>     /* for off_t */
@@ -388,6 +388,12 @@ typedef uLong FAR uLongf;
 #  define z_off_t long
 #endif
 
+#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
+#  define z_off64_t off64_t
+#else
+#  define z_off64_t z_off_t
+#endif
+
 #if defined(__OS400__)
 #  define NO_vsnprintf
 #endif