From eba1e7cb9ee547e96cfee2fa8faf5de92c6be507 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 18 Mar 2021 06:40:28 -0400
Subject: build: Don't clean source files in in-tree build

---
diff --git a/Makefile.am b/Makefile.am
index ab12c71..1fed884 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -63,7 +63,7 @@ dodge_balls_LDADD = \
 	$(EXPAT_LIBS)
 dodge_balls_LINK = $(LINK) version.c
 EXTRA_dodge_balls_DEPENDENCIES = version.c $(DATA)
-CLEANFILES = version.c $(DATA)
+CLEANFILES = version.c
 CONFIG_CLEAN_FILES =
 EXTRA_DIST = autogen.sh
 uninstall_dirs =
diff --git a/configure.ac b/configure.ac
index e43c092..9d0173c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,8 @@ AM_SILENT_RULES([yes])
 AM_CONDITIONAL([IN_GIT],
 	[test -d "${srcdir}/.git" && command -v git >/dev/null 2>&1])
 
+AM_CONDITIONAL([OUT_OF_TREE], [test x"${srcdir}" != x'.' ])
+
 save_CFLAGS="${CFLAGS-}"
 AC_PROG_CC()
 AM_PROG_CC_C_O()
diff --git a/games/classic/local.mk b/games/classic/local.mk
index 0cb0d63..f22e007 100644
--- a/games/classic/local.mk
+++ b/games/classic/local.mk
@@ -22,6 +22,13 @@ dist_noinst_DATA = \
 nodist_games_classic_DATA = \
 	%reldir%/tileset.png
 
+CLEANFILES += \
+	$(nodist_games_classic_DATA)
+if OUT_OF_TREE
+CLEANFILES += \
+	$(dist_games_classic_DATA)
+endif
+
 # To run in place, the engine needs game data in the build directory, which may
 # be different from the source directory.
 $(dist_games_classic_DATA) $(dist_noinst_DATA): %reldir%/$(am__dirstamp)
--
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