From 301d50eaa345f6c3739138a0bc575f0d9ae49100 Mon Sep 17 00:00:00 2001
From: Brent Cook <bcook@openbsd.org>
Date: Wed, 18 Jan 2017 22:58:04 -0600
Subject: [PATCH] check if EXTRA_EXPORT is set, fix cmake builds on OpenBSD

---
 crypto/CMakeLists.txt | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 45765d4..38c0b27 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -785,10 +785,12 @@ foreach(SYM IN LISTS CRYPTO_UNEXPORT)
 	string(REPLACE "${SYM}\n" "" SYMS ${SYMS})
 endforeach()
 file(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym ${SYMS})
-list(SORT EXTRA_EXPORT)
-foreach(SYM IN LISTS EXTRA_EXPORT)
-	file(APPEND ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym "${SYM}\n")
-endforeach()
+if(EXTRA_EXPORT)
+	list(SORT EXTRA_EXPORT)
+	foreach(SYM IN LISTS EXTRA_EXPORT)
+		file(APPEND ${CMAKE_CURRENT_SOURCE_DIR}/crypto_p.sym "${SYM}\n")
+	endforeach()
+endif()
 
 add_library(crypto-objects OBJECT ${CRYPTO_SRC})
 if (BUILD_SHARED)