Add an option to force vendored GLFW and GLEW

CMakeLists.txt

@@ -26,6 +26,9 @@ option(BONZOMATIC_NDI "Enable NDI?" OFF)
 
 option(BONZOMATIC_TOUCHBAR "Compile with macOS TouchBar support (Xcode 9 or newer required)?" ON)
 
+option(BONZOMATIC_EXTERNAL_GLFW "Use the vendored version of GLFW even if it is installed?" OFF)
+option(BONZOMATIC_EXTERNAL_GLEW "Use the vendored version of GLEW even if it is installed?" OFF)
+
 set(BONZOMATIC_WINDOWS_FLAVOR "DX11" CACHE STRING "Windows renderer flavor selected at CMake configure time (DX11, DX9 or GLFW)")
 set_property(CACHE BONZOMATIC_WINDOWS_FLAVOR PROPERTY STRINGS DX11 DX9 GLFW) 
 
@@ -67,7 +70,7 @@ if (APPLE OR UNIX OR (WIN32 AND (${BONZOMATIC_WINDOWS_FLAVOR} MATCHES "GLFW")))
   # GLFW settings and project inclusion
   find_package(PkgConfig)
   pkg_check_modules(GLFW glfw3>=3.3)
-  if (GLFW_FOUND)
+  if (GLFW_FOUND AND NOT BONZOMATIC_EXTERNAL_GLFW)
     set(BZC_PROJECT_INCLUDES ${BZC_PROJECT_INCLUDES} ${GLFW_INCLUDES})
     set(BZC_PROJECT_LIBS ${BZC_PROJECT_LIBS} ${GLFW_LIBRARIES})
   else()
@@ -93,7 +96,7 @@ if (APPLE OR UNIX OR (WIN32 AND (${BONZOMATIC_WINDOWS_FLAVOR} MATCHES "GLFW")))
   ##############################################################################
   # GLEW
   pkg_check_modules(GLEW glew)
-  if (GLEW_FOUND)
+  if (GLEW_FOUND AND NOT BONZOMATIC_EXTERNAL_GLEW)
     set(BZC_PROJECT_INCLUDES ${BZC_PROJECT_INCLUDES} ${GLEW_INCLUDES})
     set(BZC_PROJECT_LIBS ${BZC_PROJECT_LIBS} ${GLEW_LIBRARIES})
   else ()