Update FindLibSSH module to the lastest version.

cmake/Modules/FindLibSSH.cmake

@@ -26,8 +26,10 @@ else (LIBSSH_LIBRARIES AND LIBSSH_INCLUDE_DIRS)
       /usr/local/include
       /opt/local/include
       /sw/include
+      ${CMAKE_INCLUDE_PATH}
+      ${CMAKE_INSTALL_PREFIX}/include
   )
-
+  
   find_library(SSH_LIBRARY
     NAMES
       ssh
@@ -37,11 +39,13 @@ else (LIBSSH_LIBRARIES AND LIBSSH_INCLUDE_DIRS)
       /usr/local/lib
       /opt/local/lib
       /sw/lib
+      ${CMAKE_LIBRARY_PATH}
+      ${CMAKE_INSTALL_PREFIX}/lib
   )
 
-  if (SSH_LIBRARY)
+  if (LIBSSH_INCLUDE_DIR AND SSH_LIBRARY)
     set(SSH_FOUND TRUE)
-  endif (SSH_LIBRARY)
+  endif (LIBSSH_INCLUDE_DIR AND SSH_LIBRARY)
 
   set(LIBSSH_INCLUDE_DIRS
     ${LIBSSH_INCLUDE_DIR}
@@ -56,23 +60,34 @@ else (LIBSSH_LIBRARIES AND LIBSSH_INCLUDE_DIRS)
     if (LibSSH_FIND_VERSION)
       file(STRINGS ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h LIBSSH_VERSION_MAJOR
         REGEX "#define[ ]+LIBSSH_VERSION_MAJOR[ ]+[0-9]+")
-      string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_MAJOR ${LIBSSH_VERSION_MAJOR})
-      file(STRINGS ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h LIBSSH_VERSION_MINOR
-        REGEX "#define[ ]+LIBSSH_VERSION_MINOR[ ]+[0-9]+")
-      string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_MINOR ${LIBSSH_VERSION_MINOR})
-      file(STRINGS ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h LIBSSH_VERSION_PATCH
-        REGEX "#define[ ]+LIBSSH_VERSION_MICRO[ ]+[0-9]+")
-      string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_PATCH ${LIBSSH_VERSION_PATCH})
+      # Older versions of libssh like libssh-0.2 have LIBSSH_VERSION but not LIBSSH_VERSION_MAJOR
+      if (LIBSSH_VERSION_MAJOR)
+        string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_MAJOR ${LIBSSH_VERSION_MAJOR})
+	file(STRINGS ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h LIBSSH_VERSION_MINOR
+          REGEX "#define[ ]+LIBSSH_VERSION_MINOR[ ]+[0-9]+")
+	string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_MINOR ${LIBSSH_VERSION_MINOR})
+	file(STRINGS ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h LIBSSH_VERSION_PATCH
+          REGEX "#define[ ]+LIBSSH_VERSION_MICRO[ ]+[0-9]+")
+	string(REGEX MATCH "[0-9]+" LIBSSH_VERSION_PATCH ${LIBSSH_VERSION_PATCH})
 
-      set(LibSSH_VERSION ${LIBSSH_VERSION_MAJOR}.${LIBSSH_VERSION_MINOR}.${LIBSSH_VERSION_PATCH})
+	set(LibSSH_VERSION ${LIBSSH_VERSION_MAJOR}.${LIBSSH_VERSION_MINOR}.${LIBSSH_VERSION_PATCH})
 
-      include(FindPackageVersionCheck)
-      find_package_version_check(LibSSH DEFAULT_MSG)
+	include(FindPackageVersionCheck)
+	find_package_version_check(LibSSH DEFAULT_MSG)
+      else (LIBSSH_VERSION_MAJOR)
+        message(STATUS "LIBSSH_VERSION_MAJOR not found in ${LIBSSH_INCLUDE_DIR}/libssh/libssh.h, assuming libssh is too old")
+        set(LIBSSH_FOUND FALSE)
+      endif (LIBSSH_VERSION_MAJOR)
     endif (LibSSH_FIND_VERSION)
   endif (SSH_FOUND)
 
-  include(FindPackageHandleStandardArgs)
-  find_package_handle_standard_args(LibSSH DEFAULT_MSG LIBSSH_LIBRARIES LIBSSH_INCLUDE_DIRS)
+  # If the version is too old, but libs and includes are set,
+  # find_package_handle_standard_args will set LIBSSH_FOUND to TRUE again,
+  # so we need this if() here.
+  if (LIBSSH_FOUND)
+    include(FindPackageHandleStandardArgs)
+    find_package_handle_standard_args(LibSSH DEFAULT_MSG LIBSSH_LIBRARIES LIBSSH_INCLUDE_DIRS)
+  endif (LIBSSH_FOUND)
 
   # show the LIBSSH_INCLUDE_DIRS and LIBSSH_LIBRARIES variables only in the advanced view
   mark_as_advanced(LIBSSH_INCLUDE_DIRS LIBSSH_LIBRARIES)