How to define several include path in Makefile

Question

New to C    Basic understanding of includes  libraries and the compile process  Did a few simple makefiles yet   My current project involves using an informix DB api and i need to include header files in more than one nonstandard dirs  How to write that   Havent found anything on the net  probably because i did not use good search terms  This is one way what i tried  not working   Just to show the makefile   LIB -L usr informix lib c   INC -I usr informix incl c    opt informix incl public  default     main  main    test cpp         gcc -Wall   LIB    INC  -c test cpp          gcc -Wall   LIB    INC  -I opt informix incl public -c test cpp  clean          rm -r test o make out

User · Accepted Answer

You have to prepend every directory with -I   INC -I usr informix incl c   -I opt informix incl public

User · Answer

Make s substitutions feature is nice and helped me to write   i  src   c   INCLUDE          gcc -E   CPPFLAGS    INCLUDE   -I      lt   gt      You might find this useful  because it asks make to check for changes in include folders too

User · Answer

You need to use -I with each directory  But you can still delimit the directories with whitespace if you use  GNU  make s foreach   INC   DIR1    DIR2      INC PARAMS   foreach d    INC   -I d

[c++] How to define several include path in Makefile

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