Index: contrib/bmake/bmake.1
===================================================================
--- contrib/bmake/bmake.1	(revision 305306)
+++ contrib/bmake/bmake.1	(working copy)
@@ -556,6 +556,8 @@
 Assign with expansion, i.e. expand the value before assigning it
 to the variable.
 Normally, expansion is not done until the variable is referenced.
+.It Ic \&::=
+The same as `:=' for future POSIX compatibility.
 .Em NOTE :
 References to undefined variables are
 .Em not
Index: contrib/bmake/parse.c
===================================================================
--- contrib/bmake/parse.c	(revision 305306)
+++ contrib/bmake/parse.c	(working copy)
@@ -1800,6 +1800,8 @@
 	    return TRUE;
 	if (*line == '=' && ISEQOPERATOR(ch))
 	    return TRUE;
+        if (ch == ':' && strncmp(line, ":=", 2) == 0)
+            return TRUE;
 	if (wasSpace)
 	    return FALSE;
     }
@@ -1898,6 +1900,8 @@
 	case ':':
 	    type = VAR_SUBST;
 	    *opc = '\0';
+            if (opc[-1] == ':')
+                opc[-1] = '\0';
 	    break;
 
 	case '!':