Makefile: Missing Separator

The commands in makefile must start with the tab key.

Today I wrote a simple makefile, which always mentions missing separator. The makefile written a few days ago can still be executed, but it cannot be executed now.

It is probably because I configured Vim some days ago.

Therefore, in the tab key configuration options in. vimrc, exclude one by one and test whether makefile can be executed one by one.

When the set smarttab is commented out, The makefile error message disappears. Solve the problem!

It may be because smarttab enables the tab key to express the space character.

Happy...