thodg/libgit2

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44fa00d..82733f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,10 @@ v0.21 + 1
   as, so this introduces the USERNAME credential type which the ssh
   transport will use to ask for the username.
 
+* The build system now accepts an option EMBED_SSH_PATH which when set
+  tells it to include a copy of libssh2 at the given location. This is
+  enabled for MSVC.
+
 * The git_transport_register function no longer takes a priority and takes
   a URL scheme name (eg "http") instead of a prefix like "http://"
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76cca4f..7da4a89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +60,10 @@ IF(MSVC)
 	# HTTP transport, invoke CMake with the "-DWINHTTP=OFF" argument.
 	OPTION( WINHTTP			"Use Win32 WinHTTP routines"	ON  )
 
+	# If you want to embed a copy of libssh2 into libgit2, pass a
+	# path to libssh2
+	OPTION( EMBED_SSH_PATH		"Path to libssh2 to embed (Windows)" OFF )
+
 	ADD_DEFINITIONS(-D_SCL_SECURE_NO_WARNINGS)
 	ADD_DEFINITIONS(-D_CRT_SECURE_NO_DEPRECATE)
 	ADD_DEFINITIONS(-D_CRT_NONSTDC_NO_DEPRECATE)
@@ -134,6 +138,13 @@ STRING(REGEX REPLACE "^.*LIBGIT2_SOVERSION ([0-9]+)$" "\\1" LIBGIT2_SOVERSION "$
 # Find required dependencies
 INCLUDE_DIRECTORIES(src include)
 
+IF (WIN32 AND EMBED_SSH_PATH)
+	FILE(GLOB SRC_SSH "${EMBED_SSH_PATH}/src/*.c")
+	INCLUDE_DIRECTORIES("${EMBED_SSH_PATH}/include")
+	FILE(WRITE "${EMBED_SSH_PATH}/src/libssh2_config.h" "#define HAVE_WINCNG\n#define LIBSSH2_WINCNG\n#include \"../win32/libssh2_config.h\"")
+	ADD_DEFINITIONS(-DGIT_SSH)
+ENDIF()
+
 IF (WIN32 AND WINHTTP AND NOT MINGW)
 	ADD_DEFINITIONS(-DGIT_WINHTTP)
 	INCLUDE_DIRECTORIES(deps/http-parser)
@@ -393,7 +404,7 @@ ELSE()
 ENDIF()
 
 # Compile and link libgit2
-ADD_LIBRARY(git2 ${SRC_H} ${SRC_GIT2} ${SRC_OS} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1} ${WIN_RC})
+ADD_LIBRARY(git2 ${SRC_H} ${SRC_GIT2} ${SRC_OS} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SSH} ${SRC_SHA1} ${WIN_RC})
 TARGET_LINK_LIBRARIES(git2 ${SSL_LIBRARIES})
 TARGET_LINK_LIBRARIES(git2 ${SSH_LIBRARIES})
 TARGET_LINK_LIBRARIES(git2 ${GSSAPI_LIBRARIES})
@@ -459,7 +470,7 @@ IF (BUILD_CLAR)
 		${CLAR_PATH}/clar.c
 		PROPERTIES OBJECT_DEPENDS ${CLAR_PATH}/clar.suite)
 
-	ADD_EXECUTABLE(libgit2_clar ${SRC_H} ${SRC_GIT2} ${SRC_OS} ${SRC_CLAR} ${SRC_TEST} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1})
+	ADD_EXECUTABLE(libgit2_clar ${SRC_H} ${SRC_GIT2} ${SRC_OS} ${SRC_CLAR} ${SRC_TEST} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SSH} ${SRC_SHA1})
 
 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSL_LIBRARIES})
 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSH_LIBRARIES})