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-rw-r--r--CMakeLists.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 18f71582f..27e36756a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,6 +61,7 @@ ENDIF(APPLE)
IF(UNIX)
FIND_PACKAGE(X11)
+ ADD_DEFINITIONS(-DUSE_X11)
SET( FLTK_PLATFORM_DEPENDENT_LIBS ${X11_LIBRARIES} -lm)
ENDIF(UNIX)