osx - sed on linux and MacOS in Makefile -

I am writing a makefile which is working on Linux and Macod system. I use the sed program It has been found that BSD sed and gnu sed differ in a small but significant detail I quote from the man page:

  BSD: -I extension ... GNU: -i [SOFFIX], -in-place [= SUFFIX]  

then call me on Mac

 < The empty string is required after code> sed -i '' -e / foo / bar / 'file.tmp  

where -i , while on the Linux machine I call

sed -i 's / foo / bar /' file.tmp

here The question is:

Is there a safe way to distinguish between two OS in the makefile?

I definitely call the user Makefile.mac or Makefile.linux , but instead I avoid it.

safe way -i option sed Do not use it. This option is an unused eligible extension and is not part of POSIX.