Upstream-PR: https://github.com/neovim/unibilium/pull/21

From 8447cc364ac9f42745fdabba54fa8e628451f33b Mon Sep 17 00:00:00 2001
From: orbea <orbea@riseup.net>
Date: Mon, 20 Jun 2022 14:52:04 -0700
Subject: [PATCH] build: Add a minimal configure.ac

When building with slibtool using the rlibtool symlink the build will
fail when it fails to find the generated libtool. This is required so
rlibtool can determine if it should build shared or static libraries.

This can be fixed by adding a minimal configure.ac that can generate the
required files with autoreconf.

Gentoo Bug: https://bugs.gentoo.org/828492
---
 Makefile => Makefile.in | 31 +++++++++++++++++--------------
 configure.ac            | 16 ++++++++++++++++
 2 files changed, 33 insertions(+), 14 deletions(-)
 rename Makefile => Makefile.in (92%)
 create mode 100644 configure.ac

diff --git a/Makefile b/Makefile.in
similarity index 92%
rename from Makefile
rename to Makefile.in
index 6060ee6..d97e222 100644
--- a/Makefile
+++ b/Makefile.in
@@ -2,21 +2,19 @@ ifneq ($(wildcard .maint),)
   include maint.mk
 endif
 
-ifeq ($(shell uname),Darwin)
-  LIBTOOL?=glibtool
-else
-  LIBTOOL?=libtool
-endif
+CC=@CC@
+LIBTOOL=@LIBTOOL@
 
-CFLAGS?=-O2
+CFLAGS=@CFLAGS@
+LDFLAGS=@LDFLAGS@
 
 CFLAGS_DEBUG=
 
-PACKAGE=unibilium
+PACKAGE=@PACKAGE_NAME@
 
-PKG_MAJOR=2
-PKG_MINOR=1
-PKG_REVISION=1
+PKG_MAJOR=@MAJOR@
+PKG_MINOR=@MINOR@
+PKG_REVISION=@PATCH@
 
 PKG_VERSION=$(PKG_MAJOR).$(PKG_MINOR).$(PKG_REVISION)
 
@@ -26,10 +24,15 @@ LT_REVISION=1
 LT_CURRENT=4
 LT_AGE=0
 
-PREFIX=/usr/local
-LIBDIR=$(PREFIX)/lib
-INCDIR=$(PREFIX)/include
-MANDIR=$(PREFIX)/share/man
+top_builddir=@top_builddir@
+
+prefix=@prefix@
+exec_prefix=@prefix@
+datarootdir=@datarootdir@
+
+LIBDIR=@libdir@
+INCDIR=@includedir@
+MANDIR=@mandir@
 MAN3DIR=$(MANDIR)/man3
 
 ifneq ($(OS),Windows_NT)
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..13cb888
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,16 @@
+m4_define([MAJOR], [2])
+m4_define([MINOR], [1])
+m4_define([PATCH], [1])
+
+AC_INIT([unibilium], [MAJOR.MINOR.PATCH])
+AC_CONFIG_FILES([Makefile])
+
+LT_INIT
+
+AC_SUBST([top_builddir], [$abs_builddir])
+
+AC_SUBST([MAJOR], [MAJOR])
+AC_SUBST([MINOR], [MINOR])
+AC_SUBST([PATCH], [PATCH])
+
+AC_OUTPUT