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

@@ -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

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