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-rw-r--r--src/_cffi_src/build_openssl.py9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/_cffi_src/build_openssl.py b/src/_cffi_src/build_openssl.py
index 2ff28d75..14ba5b35 100644
--- a/src/_cffi_src/build_openssl.py
+++ b/src/_cffi_src/build_openssl.py
@@ -38,8 +38,15 @@ def _osx_libraries(build_static):
_PRE_INCLUDE = """
+#include <openssl/opensslv.h>
+/*
+ LibreSSL removed e_os2.h from the public headers so we'll only include it
+ if we're using vanilla OpenSSL.
+*/
+#if !defined(LIBRESSL_VERSION_NUMBER)
#include <openssl/e_os2.h>
-#if defined(OPENSSL_SYS_WINDOWS)
+#endif
+#if defined(_WIN32)
#include <windows.h>
#endif
"""