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-rw-r--r--crawl-ref/source/syscalls.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/syscalls.h b/crawl-ref/source/syscalls.h
index 0262e18467..8bbb832ae9 100644
--- a/crawl-ref/source/syscalls.h
+++ b/crawl-ref/source/syscalls.h
@@ -22,7 +22,7 @@ int mkstemp(char *dummy);
# endif
#endif
-#ifndef HAVE_FDATASYNC
+#ifndef CRAWL_HAVE_FDATASYNC
int fdatasync(int fd);
#endif