--- Makefile.in.orig   2017-08-23 06:49:52.000000000 -0600
+++ Makefile.in        2019-05-27 21:11:10.304632260 -0600
@@ -13,11 +13,12 @@
 # (enclosed in the file LGPL).
 
 # where to install the binaries
-DESTDIR=@prefix@
-# prefix=@prefix@
+
+prefix=@prefix@
+libdir=@libdir@
 # exec_prefix=@exec_prefix@
 # BINDIR=$(DESTDIR)@bindir@
-LIBDIR=$(DESTDIR)/lib/
+LIBDIR=$(prefix)$(libdir)
 # DATADIR=$(DESTDIR)@datadir@/ocplib-simplex
 
 # where to install the man page
@@ -112,12 +113,14 @@
 ##############
 
 install: all META
-	OCAMLFIND_DESTDIR=$(LIBDIR) \
+	mkdir -p $(DESTDIR)$(LIBDIR)
+	OCAMLFIND_DESTDIR=$(DESTDIR)$(LIBDIR) \
 	  ocamlfind install ocplib-simplex src/$(LIBNAME).* src/*.mli META
 
 
 uninstall:
-	ocamlfind remove ocplib-simplex
+	OCAMLFIND_DESTDIR=$(DESTDIR)$(LIBDIR) \
+	  ocamlfind remove ocplib-simplex
 
 # generic rules
 ###############