Add -p option for mkdir to suppress error. Compiling nkf in Docker, error occur and ignored by make. https://github.com/conao3/docker-nkf ``` Step 6/13 : RUN git clone https://github.com/nurse/nkf.git ---> Using cache ---> 1f18636e4d38 Step 7/13 : WORKDIR nkf ---> Using cache ---> e0210ecbf6aa Step 8/13 : RUN make ---> Using cache ---> 62e20c0b3115 Step 9/13 : RUN make install ---> Running in 79714e0da6e0 mkdir: can't create directory '/usr/local/bin': File exists make: [Makefile:49: install-main] Error 1 (ignored) ``` mkdir has option -p and it suppress error if directory has existed. ``` -p, --parents no error if existing, make parent directories as needed ```