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Asked: 2026-06-02T09:14:12+00:00

Suppose in my makefile I have program_INCLUDE_DIRS += ../inc CPPFLAGS += $(foreach includedir,$(program_INCLUDE_DIRS),-I$(includedir)) Now

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Suppose in my makefile I have 

   program_INCLUDE_DIRS += ../inc 
   CPPFLAGS += $(foreach includedir,$(program_INCLUDE_DIRS),-I$(includedir))

Now I want to include a directory named ../inc2 (which is present one directory above where I am running the makefile) while running the makefile through the command line

I know that I should set the ../inc2 directory to CPPFLAGS.

Please suggest me the syntax of the command to include the directory ../inc2 through command line. Also I dont want to override the existing directory included in the makefile(../inc above).

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1 Answer

  1. Editorial Team

    The += means CPPFLAGS is appended instead of replaced. That means you can set it in your shell and the existing directories will get appended, like this:

    export CPPFLAGS=-I../inc2
make

    If you need to do this a lot, the better solution would be to change your makefile to say:

    program_INCLUDE_DIRS += ../inc ../inc2
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