Document MACOSX_DEPLOYMENT_TARGET.

diff --git a/hints/darwin.sh b/hints/darwin.sh
index 3e92add..fec05fd 100644 (file)
--- a/hints/darwin.sh
+++ b/hints/darwin.sh
@@ -201,6 +201,8 @@ case "$osvers" in
    lddlflags="${ldflags} -bundle -undefined suppress"
    ;;
 *) 
+   # MACOSX_DEPLOYMENT_TARGET selects the minimum OS level we want to support
+   # https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/cross_development/Configuring/configuring.html
    lddlflags="${ldflags} -bundle -undefined dynamic_lookup"
    case "$ld" in
        *MACOSX_DEVELOPMENT_TARGET*) ;;