notmuch has no tcl code, and doxygen upstream is deprecating/removing
tcl support anyway:
https://github.com/doxygen/doxygen/commit/48a7afc0caf69857a42b0fe1963db3440cb4000f
---
doc/doxygen.cfg | 1 -
1 file changed, 1 deletion(-)
diff --git a/doc/doxygen.cfg b/doc/doxygen.cfg
index a2c4fd07..4a022de1 100644
--- a/doc/doxygen.cfg
+++ b/doc/doxygen.cfg
@@ -27,7 +27,6 @@ INHERIT_DOCS = YES
SEPARATE_MEMBER_PAGES = NO
TAB_SIZE = 8
ALIASES =
-TCL_SUBST =
OPTIMIZE_OUTPUT_FOR_C = YES
OPTIMIZE_OUTPUT_JAVA = NO
OPTIMIZE_FOR_FORTRAN = NO
--
2.29.2