thodg/libgit2

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69ce6fe..81dc4c2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,6 @@ OPTION( VALGRIND			"Configure build for valgrind"			OFF )
 
 IF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 	SET( USE_ICONV ON )
-	ADD_DEFINITIONS(-DGIT_COMMON_CRYPTO)
 ENDIF()
 
 IF(MSVC)
@@ -173,6 +172,8 @@ ENDIF()
 IF (WIN32 AND NOT MINGW AND NOT SHA1_TYPE STREQUAL "builtin")
 	ADD_DEFINITIONS(-DWIN32_SHA1)
 	FILE(GLOB SRC_SHA1 src/hash/hash_win32.c)
+ELSEIF (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+	ADD_DEFINITIONS(-DGIT_COMMON_CRYPTO)
 ELSEIF (OPENSSL_FOUND AND NOT SHA1_TYPE STREQUAL "builtin")
 	ADD_DEFINITIONS(-DOPENSSL_SHA1)
 	IF (CMAKE_SYSTEM_NAME MATCHES "FreeBSD")