diff -ru indent-2.2.13.orig/Makefile.in indent-2.2.13/Makefile.in
--- indent-2.2.13.orig/Makefile.in	2023-01-26 10:52:31.000000000 +0100
+++ indent-2.2.13/Makefile.in	2023-03-21 18:19:33.457352230 +0100
@@ -336,7 +336,7 @@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = no-texinfo.tex
-SUBDIRS = src doc po man regression
+SUBDIRS = src doc po man
 BUILT_SOURCES = 
 DISTFILES = $(DIST_COMMON:README=README.md) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 EXTRA_DIST = README.md \