added cmake file to find nettle

credit:
https://github.com/Kitware/CMake/blob/master/Utilities/cmlibarchive/build/cmake/FindNettle.cmake

diff --git a/cmake/Modules/FindNettle.cmake b/cmake/Modules/FindNettle.cmake
new file mode 100644 (file)
index 0000000..1880092
--- /dev/null
+++ b/cmake/Modules/FindNettle.cmake
@@ -0,0 +1,25 @@
+# https://github.com/Kitware/CMake/blob/master/Utilities/cmlibarchive/build/cmake/FindNettle.cmake
+#
+# - Find Nettle
+# Find the Nettle include directory and library
+#
+#  NETTLE_INCLUDE_DIR    - where to find <nettle/sha.h>, etc.
+#  NETTLE_LIBRARIES      - List of libraries when using libnettle.
+#  NETTLE_FOUND          - True if libnettle found.
+
+IF (NETTLE_INCLUDE_DIR)
+  # Already in cache, be silent
+  SET(NETTLE_FIND_QUIETLY TRUE)
+ENDIF (NETTLE_INCLUDE_DIR)
+
+FIND_PATH(NETTLE_INCLUDE_DIR nettle/md5.h nettle/ripemd160.h nettle/sha.h)
+FIND_LIBRARY(NETTLE_LIBRARY NAMES nettle libnettle)
+
+# handle the QUIETLY and REQUIRED arguments and set NETTLE_FOUND to TRUE if 
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(NETTLE DEFAULT_MSG NETTLE_LIBRARY NETTLE_INCLUDE_DIR)
+
+IF(NETTLE_FOUND)
+  SET(NETTLE_LIBRARIES ${NETTLE_LIBRARY})
+ENDIF(NETTLE_FOUND)