The user-visible preprocessor construct is called __has_include.
2019-06-05 Florian Weimer <fweimer@redhat.com>
* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Do not use
internal GCC preprocessor identifier __has_include__.
diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
index cd5c400977..f2dfcc50d0 100644
--- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -21,7 +21,7 @@
#include <stdlib.h>
#include <atomic.h>
#include <sys/cachectl.h>
-#if __has_include__ (<asm/syscalls.h>)
+#if __has_include (<asm/syscalls.h>)
# include <asm/syscalls.h>
#else
# include <asm/unistd.h>