osx - Undefined symbols for architecture x86_64: "_glBegin" -

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i'm trying build source code , after passing/fixing ton of errors, i'm stuck @ point have no idea how fix. i'm novice in building sources tried search error , none of them worked me although i'm not sure if implemented them correctly. i'm on osx 10.8.5 xcode 5.1.1

i'm striving make cmake file @ 75% i'm getting error (brief form):

undefined symbols architecture x86_64: "_glbegin", referenced from: alembicholderoverride::draw(mhwrender::mdrawcontext const&, muserdata const*) in alembicholderoverride.cpp.o

and portion of cmakelist have: 

# fix stop crash on osx < 10.9 set(cmake_osx_deployment_target 10.8)  # compiler flags if (${cmake_system_name} matches "windows")     # disable of bullshit warnings msvc wants barf     add_definitions( "-w3 -mp -d_crt_secure_no_warnings -wd4005 -wd4996 -wd4305 -wd4244 -nologo" )     set(cmake_cxx_flags "${cmake_cxx_flags} /mp") endif()  if( "${cmake_system_name}" matches "darwin" )     set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++03 -stdlib=libstdc++ -framework opengl")  endif()  if( "${cmake_system_name}" matches "linux" )     add_definitions(-d_linux)     set(cmake_cxx_flags "${cmake_cxx_flags} -o3 -fvisibility=hidden -fpic") endif()

i appreciate on in advance, , please don't hesitate let me know if part of cmakelist build flags wrong since i'm not experienced in this.

you need link opengl:

find_package(opengl required) ... add_(library|executable)(<your-target> ...) ... target_include_directories(<your-target> private ${opengl_include_dir}) target_link_libraries(<your-target> private ${opengl_libraries})

(you may need public linking if it's library public headers using opengl)

or traditional way:

find_package(opengl required) include_directories(${opengl_include_dir}) link_libraries(${opengl_libraries}) ... add_(library|executable)(<your-target> ...)

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