The tune for SARIE MARAIS (current Afrikaans spelling) is "Ellie Rhee," or "Carry Me Back to Tennessee," by Septimus Winner, 1865. Sheet music at American Memory. http://scriptorium.lib.duke.edu/sheetmusic/b/b10/b1043/
Ellie Rhee
Ons Blerkas, linked above, has an excellent piano midi (scroll down to LIEFDE-SKEIDING EN VERLANGE).
This song of longing for Sarie Marais and home also is known as "The Old Transvaal," and is a favorite from the time of the Boer War. Marais and Miranda said it was their favorite song, and often sang it in concert.
Burl Ives used a variant for his "Foggy, Foggy Dew."