From 1c0988b8e2a0bee2b499f3fe7d3079a53d8f5c90 Mon Sep 17 00:00:00 2001
From: Joachim Wiberg <troglobit@gmail.com>
Date: Sun, 28 Nov 2021 19:22:45 +0100
Subject: [PATCH] Fix #18: optional compat symlink lite -> libite/

Default is to create the symlink, to facilitate upgrades.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
---
 configure.ac    | 10 ++++++++--
 src/Makefile.am | 15 +++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8c0c11a..b2d51c1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,13 @@ DX_CHM_FEATURE(OFF)
 DX_HTML_FEATURE(ON)
 DX_MAN_FEATURE(OFF)
 DX_INIT_DOXYGEN(${PACKAGE_NAME}, [${top_builddir}/doc/Doxyfile], [${top_builddir}/doc])
-AM_CONDITIONAL(ENABLE_DOXYGEN,[test "x${DX_FLAG_doc}" = x1])
-AM_CONDITIONAL(ENABLE_HTML,[test "x${DX_FLAG_html}" = x1])
+
+AC_ARG_WITH([symlink],
+        AS_HELP_STRING([--without-symlink], [Disable compat /usr/include/lite -> libite symlink]),,
+	[with_symlink=yes])
+
+AM_CONDITIONAL([ENABLE_DOXYGEN], [test "x${DX_FLAG_doc}"  = x1])
+AM_CONDITIONAL([ENABLE_HTML],    [test "x${DX_FLAG_html}" = x1])
+AM_CONDITIONAL([COMPAT_SYMLINK], [test "x$with_symlink"  != "xno"])
 
 AC_OUTPUT
diff --git a/src/Makefile.am b/src/Makefile.am
index 4fde732..d905730 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -28,3 +28,18 @@ pkginclude_HEADERS  = lite.h queue.h conio.h tree.h strlite.h strdupa.h	\
 
 pkgconfigdir        = $(libdir)/pkgconfig
 pkgconfig_DATA      = libite.pc
+
+## For compatibility with existing installations that look for lite/lite.h
+if COMPAT_SYMLINK
+install-data-hook:
+	link=$(DESTDIR)$(includedir)/lite;                   \
+	if [ ! -f $$link ]; then                             \
+		$(LN_S) libite $$link;                       \
+	fi
+
+uninstall-hook:
+	link=$(shell readlink $(DESTDIR)$(includedir)/lite); \
+	if [ "$$link" = "libite" ]; then                     \
+		$(RM) $(DESTDIR)$(includedir)/lite;          \
+	fi
+endif