smr_with_build_path

This macro adds a "--with-build-path" option to the configure script. This configure option provides a convenient way to add "-I" options to CPPFLAGS and "-L" options to LDFLAGS, at configure time.

Invoking "./configure --with-build-path=DIR" results in "-I DIR/include" being added to CPPFLAGS if DIR/include exists, and "-L DIR/lib" being added to LDFLAGS if DIR/lib exists.

Separate multiple directories using colons; e.g. "--with-build-path=DIR1:DIR2:DIR3".

AC_DEFUN([smr_WITH_BUILD_PATH],
[
    AC_ARG_WITH([build-path],
    [  --with-build-path=DIR   build using DIR/include and DIR/lib],
    [
        for d in `echo $withval | tr : ' '`; do
            test -d $d/include && CPPFLAGS="$CPPFLAGS -I$d/include"
            test -d $d/lib && LDFLAGS="$LDFLAGS -L$d/lib"
        done
    ])
])