diff --git a/zconf.h b/zconf.h
index dda00da..92fb4c0 100644
--- a/zconf.h
+++ b/zconf.h
@@ -168,6 +168,8 @@
 #  define gz_header_s           z_gz_header_s
 #  define internal_state        z_internal_state
 
+/* variable from zutil.h */
+#  define z_errmsg              z_z_errmsg
 #endif
 
 #if defined(__MSDOS__) && !defined(MSDOS)
diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index a7f24cc..853daf2 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -165,6 +165,8 @@
 #  define gz_header_s           z_gz_header_s
 #  define internal_state        z_internal_state
 
+/* variable from zutil.h */
+#  define z_errmsg              z_z_errmsg
 #endif
 
 #if defined(__MSDOS__) && !defined(MSDOS)
diff --git a/zconf.h.in b/zconf.h.in
index 5e1d68a..3ed18f0 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -163,6 +163,8 @@
 #  define gz_header_s           z_gz_header_s
 #  define internal_state        z_internal_state
 
+/* variable from zutil.h */
+#  define z_errmsg              z_z_errmsg
 #endif
 
 #if defined(__MSDOS__) && !defined(MSDOS)