Fix error of shm_open,... not found. Add librt.

CMakeLists.txt

@@ -35,6 +35,11 @@ message("Without libjpeg")
 target_compile_definitions(blc PRIVATE -DWITHOUT_JPEG)
 endif()
 
+if(UNIX AND NOT APPLE)
+	target_link_libraries(blc PRIVATE rt)
+endif()
+
+
 
 #Both version of librairies will have the same name only the extension will change.
 set_target_properties(static_blc PROPERTIES OUTPUT_NAME blc)