1 files changed, 27 insertions, 6 deletions

diff --git a/miscutils/make.c b/miscutils/make.c
index f594e196b..c69dcec8a 100644
--- a/miscutils/make.c
+++ b/miscutils/make.c
@@ -2298,7 +2298,7 @@ make1(struct name *np, struct cmd *cp, char *oodate, char *allsrc,
                 char *dedup, struct name *implicit)
 {
         int estat;
-        char *name, *member = NULL, *base;
+        char *name, *member = NULL, *base = NULL, *prereq = NULL;
 
         name = splitlib(np->n_name, &member);
         setmacro("?", oodate, 0 | M_VALID);
@@ -2308,12 +2308,33 @@ make1(struct name *np, struct cmd *cp, char *oodate, char *allsrc,
         }
         setmacro("%", member, 0 | M_VALID);
         setmacro("@", name, 0 | M_VALID);
-        if (implicit) {
-                setmacro("<", implicit->n_name, 0 | M_VALID);
+        if (implicit || !posix) {
+                char *s;
+
+                // As an extension, if we're not dealing with an implicit
+                // rule set $< to the first out-of-date prerequisite.
+                if (implicit == NULL) {
+                        if (oodate) {
+                                s = strchr(oodate, ' ');
+                                if (s)
+                                        *s = '\0';
+                                prereq = oodate;
+                        }
+                } else
+                        prereq = implicit->n_name;
+
                 base = member ? member : name;
-                *suffix(base) = '\0';
-                setmacro("*", base, 0 | M_VALID);
-        }
+                s = suffix(base);
+                // As an extension, if we're not dealing with an implicit
+                // rule and the target ends with a known suffix, remove it
+                // and set $* to the stem, else to an empty string.
+                if (implicit == NULL && !is_suffix(s))
+                        base = NULL;
+                else
+                        *s = '\0';
+        }
+        setmacro("<", prereq, 0 | M_VALID);
+        setmacro("*", base, 0 | M_VALID);
         free(name);
 
         estat = docmds(np, cp);