$NetBSD$

* use pkgsrc c++gsl and yaml-cpp

--- CMakeLists.txt.orig	2020-02-05 05:36:17.000000000 +0000
+++ CMakeLists.txt
@@ -71,6 +71,8 @@ elseif(TARGET_COMPILER_MSVC)
 endif()
 
 find_package(Boost 1.35 REQUIRED)
+find_package(yaml-cpp REQUIRED)
+find_package(Microsoft.GSL REQUIRED)
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose the type of build." FORCE)
@@ -100,12 +102,10 @@ endif()
 
 add_subdirectory(Util)
 add_subdirectory(src)
-add_subdirectory(libs)
 add_subdirectory(client)
 add_subdirectory(Regex)
 add_subdirectory(Settings)
 add_subdirectory(Interpreter)
-add_subdirectory(GSL EXCLUDE_FROM_ALL)
 
 if(UNIX)
     find_package(X11)