/* Unpatched, this file would include "inc/ foo.h" (note the space) */ #define PREINC_XSTR(str) #str #define PREINC_STR(str) PREINC_XSTR(str) #define COMP_INC(comp,file) PREINC_STR(comp/file) #include COMP_INC(inc, foo.h)