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-rw-r--r--src/cmd/eqn/e.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/eqn/e.h b/src/cmd/eqn/e.h
index f94d2069..4f5282ec 100644
--- a/src/cmd/eqn/e.h
+++ b/src/cmd/eqn/e.h
@@ -1,6 +1,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <errno.h>
#undef sqrt
#define sqrt p9_sqrt