diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/STRERROR_R_CHAR_P.h b/libbuild2-autoconf/libbuild2/autoconf/checks/STRERROR_R_CHAR_P.h
new file mode 100644
index 0000000..559537e
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/STRERROR_R_CHAR_P.h
@@ -0,0 +1,15 @@
+// STRERROR_R_CHAR_P
+
+#undef STRERROR_R_CHAR_P
+
+/* GNU-specific.
+ *
+ * Note that while the HAVE_STRERROR_R_CHAR_P would have been the better
+ * name (since we are testing for presence/absence), this name is used by
+ * the autoconf's AC_FUNC_STRERROR_R test.
+ */
+#ifdef __GLIBC__
+#  if defined(_GNU_SOURCE) || (_POSIX_C_SOURCE < 200112L)
+#    define STRERROR_R_CHAR_P 1
+#  endif
+#endif