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diff --git a/pkg/utilities/nttools/stxtools/od/odunmp.x b/pkg/utilities/nttools/stxtools/od/odunmp.x
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+++ b/pkg/utilities/nttools/stxtools/od/odunmp.x
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+include "od.h"
+
+#---------------------------------------------------------------------------
+.help od_unmap Feb93 source
+.ih
+NAME
+od_unmap -- Close the 1D image.
+.ih
+USAGE
+call od_unmap (od)
+.ih
+ARGUMENTS
+.ls od (input/output: pointer)
+The OD I/O descriptor.  On return, the value will be NULL.
+.le
+.endhelp
+#---------------------------------------------------------------------------
+procedure od_unmap (od)
+
+pointer od                     # I:  The OD I/O descriptor.
+
+errchk  tbtclo, imunmap, mfree
+
+begin
+        if (od != NULL) {
+            switch (OD_TYPE(od)) {
+            case OD_TABLE:
+                call tbtclo (OD_FD(od))
+                call mfree (OD_CD_PTR(od), TY_POINTER)
+            case OD_IMAGE:
+                call mw_ctfree (OD_WL(od))
+                call mw_ctfree (OD_LW(od))
+                call mw_close (OD_MW(od))
+                call imunmap (OD_FD(od))
+            }
+
+            call mfree (OD_WSYS_PTR(od), TY_CHAR)
+            call mfree (OD_NAME_PTR(od), TY_CHAR)
+            call mfree (od, TY_STRUCT)
+        }
+end
+#---------------------------------------------------------------------------
+# End of od_unmap
+#---------------------------------------------------------------------------