diff --git a/src/config.h.in b/src/config.h.in
index 20baa63..1e0c022 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -3,6 +3,8 @@
 
 #cmakedefine HAVE_ISATTY 1
 #cmakedefine HAVE_GETOPT_H 1
+#cmakedefine HAVE_LIBINTL_H 1
+#cmakedefine HAVE_UNISTD_H 1
 #cmakedefine GEOTIFF_FOUND 1
 #cmakedefine JPEG_FOUND 1
 #cmakedefine PNG_FOUND 1