TODOs.md: Add #td-ca621da2-2e94-ae6f-0e3d-db744c00a656

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 # Tasks
 
+## TODO Send patch to upstream `bmake` for bug on `$*` macro {#td-ca621da2-2e94-ae6f-0e3d-db744c00a656}
+- TODO in 2021-11-21
+
+---
+
+From the standard:
+
+```txt
+$*      The $* macro shall evaluate to the current target name with its suf‐
+        fix deleted. It shall be evaluated at least for inference rules.
+
+        For example, in the .c.a inference rule, $*.o represents the out-of-
+        date .o file that corresponds to the prerequisite .c file.
+```
+
+Given the Makefile:
+
+```makefile
+.POSIX:
+
+.SUFFIXES: .x .y
+
+.x.y:
+        cp $< $*.y
+
+all: a/b.y
+```
+
+`bmake` works correctly without flags, but behaves incorrectly with `-j1`:
+
+```shell
+$ mkdir a && touch a/b.x
+$ make -j1
+cp a/b.x b.y
+$ make
+cp a/b.x a/b.y
+```
+
+This impacts the upcoming `lilypond -o $name` command in the Makefile.
+
+
 ## TODO Move content into `src/content/`, `bin/` into `src/bin/` {#td-f9b510c0-c2c5-638e-e00f-3bbd35de31d9}
 - TODO in 2022-01-10