https://github.com/SawfishWM/librep/commit/2c064d70e25137915ceaef616c2be5c8bbcc42da

From 2c064d70e25137915ceaef616c2be5c8bbcc42da Mon Sep 17 00:00:00 2001
From: orbea <orbea@riseup.net>
Date: Wed, 19 May 2021 13:19:49 -0700
Subject: [PATCH] build: Respect $(LIBTOOL)

downstream issue: https://bugs.gentoo.org/790812

Signed-off-by: orbea <orbea@riseup.net>
--- a/Makedefs.in
+++ b/Makedefs.in
@@ -83,7 +83,6 @@ COMPILE_ENV = REPLISPDIR=$(top_builddir)/lisp \
 	      REPDOCFILE=$(top_builddir)/doc-strings
 
 include $(top_srcdir)/rules.mk
-rep_LIBTOOL=@LIBTOOL@
 
 # Rule for ``normal'' C objects
 %.o : %.c
--- a/rules.mk.in
+++ b/rules.mk.in
@@ -3,19 +3,18 @@
 repcommonexecdir?=$(shell pkg-config --variable=repcommonexecdir librep)
 rpath_repcommonexecdir:=$(repcommonexecdir)
 
-rep_LIBTOOL:=$(repcommonexecdir)/libtool --tag CC
 rep_INSTALL_ALIASES:=$(repcommonexecdir)/install-aliases
 
 # use this like:
 # foo.la : foo.lo bar.lo
 #	$(rep_DL_LD) link-opts...
 
-rep_DL_LD=$(rep_LIBTOOL) --mode=link --tag=CC $(CC) -avoid-version -module -rpath $(rpath_repcommonexecdir)
+rep_DL_LD=$(LIBTOOL) --mode=link --tag=CC $(CC) -avoid-version -module -rpath $(rpath_repcommonexecdir)
 
-rep_DL_INSTALL=$(rep_LIBTOOL) --mode=install $(INSTALL)
-rep_DL_UNINSTALL=$(rep_LIBTOOL) --mode=uninstall rm
+rep_DL_INSTALL=$(LIBTOOL) --mode=install $(INSTALL)
+rep_DL_UNINSTALL=$(LIBTOOL) --mode=uninstall rm
 
 # Rule for libtool controlled C objects
 %.lo : %.c
-	$(rep_LIBTOOL) --mode=compile --tag=CC $(CC) -c $(CPPFLAGS) $(CFLAGS) $<
+	$(LIBTOOL) --mode=compile --tag=CC $(CC) -c $(CPPFLAGS) $(CFLAGS) $<