1 files changed, 6 insertions, 1 deletions

diff --git a/lib/diffseq.h b/lib/diffseq.h
index 8a823f98ea0..914bc643bb4 100644
--- a/lib/diffseq.h
+++ b/lib/diffseq.h
@@ -77,6 +77,11 @@
      #include "minmax.h"
  */
 
+/* This file uses _GL_GNUC_PREREQ.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Maximum value of type OFFSET.  */
 #ifndef OFFSET_MAX
 # define OFFSET_MAX \
@@ -93,7 +98,7 @@
 #endif
 
 /* Suppress gcc's "...may be used before initialized" warnings,
-   generated by GCC versions up to at least GCC 14.2.
+   generated by GCC versions up to at least GCC 15.1.
    Likewise for gcc -fanalyzer's "use of uninitialized value" warnings.  */
 #if _GL_GNUC_PREREQ (4, 7)
 # pragma GCC diagnostic push