~stephan-lutz/widelands/bug_1831499_empire3

Merged lp:~widelands-dev/widelands/bug_1836107_lGL:
Link GL libraries insted of setting flags.
Fixes appveyor failures due to missing lbpdcurses.dll

added added

removed removed

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# This is set to avoid linker errors when using GLVND-libs on Linux

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if("${OpenGL_GL_PREFERENCE}" STREQUAL "GLVND")

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set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lGL")

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link_libraries("GL")

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add_compile_definitions(WL_USE_GLVND)

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message(STATUS "Adding linker flags for GLVND.")

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endif()