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-rw-r--r--cryptography/bindings/openssl/api.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/cryptography/bindings/openssl/api.py b/cryptography/bindings/openssl/api.py
index 2da156cd..58adaa88 100644
--- a/cryptography/bindings/openssl/api.py
+++ b/cryptography/bindings/openssl/api.py
@@ -38,6 +38,7 @@ class API(object):
self._populate_ffi(ffi)
self._ffi = ffi
self._lib = ffi.verify("""
+ #include <openssl/err.h>
#include <openssl/evp.h>
""")
self._lib.OpenSSL_add_all_algorithms()