> This sounds very similar to what postfix does.

postfix employs ldelete as well, but I'm curious must one re-set the variable 
(CCARGS) after deleting from it?

variant pcre description "add pcre support" {
    set CCARGS      [ldelete ${CCARGS} -DNO_PCRE]
    lappend CCARGS  -DHAS_PCRE "-I${prefix}/include"
    lappend AUXLIBS "-L${prefix}/lib" -lpcre
    depends_lib-append  port:pcre
}

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