From f343708f1ff7df76e4cd696bf71acdd6314951d5 Mon Sep 17 00:00:00 2001
From: Alex Shinn <alexshinn@gmail.com>
Date: Thu, 27 Aug 2020 22:56:57 +0900
Subject: [PATCH] use gnu coding standard make path var names

---
 Makefile.libs | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/Makefile.libs b/Makefile.libs
index 970d0840..15209fed 100644
--- a/Makefile.libs
+++ b/Makefile.libs
@@ -27,16 +27,28 @@ FIND      ?= find
 SYMLINK   ?= ln -s
 LDCONFIG  ?= ldconfig
 
-PREFIX    ?= /usr/local
-BINDIR    ?= $(PREFIX)/bin
-LIBDIR    ?= $(PREFIX)/lib
-SOLIBDIR  ?= $(LIBDIR)
-INCDIR    ?= $(PREFIX)/include/chibi
-MODDIR    ?= $(PREFIX)/share/chibi
-BINMODDIR ?= $(SOLIBDIR)/chibi
-PKGCONFDIR ?= $(SOLIBDIR)/pkgconfig
-MANDIR    ?= $(PREFIX)/share/man/man1
+# gnu coding standards
+prefix      ?= /usr/local
+exec_prefix ?= $(prefix)
+bindir      ?= $(exec_prefix)/bin
+libdir      ?= $(exec_prefix)/lib
+includedir  ?= $(prefix)/include
+datarootdir ?= $(prefix)/share
+datadir     ?= $(datarootdir)
+mandir      ?= $(datarootdir)/man
+man1dir     ?= $(mandir)/man1
 
+# hysterical raisins
+BINDIR      ?= $(bindir)
+LIBDIR      ?= $(libdir)
+SOLIBDIR    ?= $(libdir)
+INCDIR      ?= $(includedir)/chibi
+MODDIR      ?= $(datadir)/chibi
+BINMODDIR   ?= $(SOLIBDIR)/chibi
+PKGCONFDIR  ?= $(SOLIBDIR)/pkgconfig
+MANDIR      ?= $(man1dir)
+
+# allow snow to be configured separately
 SNOWPREFIX    ?= /usr/local
 SNOWLIBDIR    ?= $(SNOWPREFIX)/lib
 SNOWSOLIBDIR  ?= $(SNOWLIBDIR)