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-rw-r--r--CMake/options.cmake1
1 files changed, 0 insertions, 1 deletions
diff --git a/CMake/options.cmake b/CMake/options.cmake
index 0ab1311dd..581f2e969 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -48,7 +48,6 @@ if((NOT APPLE OR OPTION_APPLE_X11) AND NOT WIN32)
include(FindX11)
if(X11_FOUND)
set(USE_X11 1)
- list(APPEND FLTK_CFLAGS -DUSE_X11)
list(APPEND FLTK_LDLIBS -lX11)
endif(X11_FOUND)
endif((NOT APPLE OR OPTION_APPLE_X11) AND NOT WIN32)