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you probably downloaded the master opencv_contrib branch, so either:

• update your main opencv to master (4.1.1-dev), too,
• checkout the 4.0.1 branch from the opencv_contrib repo
• use 3.4 (stable) branch for both repos

in any case, clean build folder, and start from scratch withcmake

you probably downloaded the master (4.1.1-dev) opencv_contrib branch, and it won'twork with your 4.0.1 main opencv, so either:

• update your main opencv to master (4.1.1-dev), too,
• checkout the 4.0.1 branch from the opencv_contrib repo
• use 3.4 (stable) branch for both repos

in any case, clean build folder, and start from scratch withcmake

you probably downloaded the master (4.1.1-dev) opencv_contrib branch, and it won'twork won't work with your 4.0.1 main opencv, so either:

• update your main opencv to master (4.1.1-dev), too,
• checkout the 4.0.1 branch from the opencv_contrib repo
• use 3.4 (stable) branch for both repos

in any case, clean build folder, and start from scratch withcmakewith cmake