How to order make do the parallel job?

[Igor Sobinov]

 Hello All,

In my makefile I have the following code: 

build_release: $(RELEASE_DIR)
  address@hidden $(RELEASE_DIR); $(MAKE) release
but when I launch the command

make build_release -j10 

I get the following error:

make[4]: warning: jobserver unavailable: using -j1.  Add `+' to parent make 
rule.

Why it occurred?
PS: I use cmake for makefiles generation, only the first one is user-defined.


Bye, Igor