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-rw-r--r--src/math/acosh.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/acosh.c b/src/math/acosh.c
index 3e64e9d1..12fe6b71 100644
--- a/src/math/acosh.c
+++ b/src/math/acosh.c
@@ -9,5 +9,6 @@ TYPE TGFN(acosh)(TYPE x)
/*
STDC(199901)
+XOPEN(400)
LINK(m)
*/