From d77cac2415db3ff6576b3f1c080b3322d727338d Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Mon, 27 Sep 2021 09:15:33 -0400
Subject: Add special logic for loading libraries when LD_LIBRARY_PATH is set.

---
 chickadee/config.scm.in | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/chickadee/config.scm.in b/chickadee/config.scm.in
index 81b0f3e..2a43918 100644
--- a/chickadee/config.scm.in
+++ b/chickadee/config.scm.in
@@ -52,11 +52,34 @@
 
 (define %chickadee-version "@PACKAGE_VERSION@")
 
-(define %libopenal '("@OPENAL_LIBDIR@/libopenal" "libopenal"))
-(define %libvorbisfile '("@VORBIS_LIBDIR@/libvorbisfile" "libvorbisfile"))
-(define %libmpg123 '("@MPG123_LIBDIR@/libmpg123" "libmpg123"))
-(define %libfreetype '("@FREETYPE_LIBDIR@/libfreetype" "libfreetype"))
-(define %libreadline '("@READLINE_LIBDIR@/libreadline" "libreadline"))
+;; When LD_LIBRARY_PATH is set, we *don't* want to use the absolute
+;; file name of the library that pkgconfig found.  Instead, we want to
+;; use the library name itself so the search path is used.
+(define-syntax-rule (define-library-name name
+                      (absolute ...)
+                      (relative ...))
+  (define name
+    (cond
+     ((getenv "LD_LIBRARY_PATH")
+      '(relative ...))
+     (else
+      '(absolute ...)))))
+
+(define-library-name %libopenal
+  ("@OPENAL_LIBDIR@/libopenal")
+  ("libopenal"))
+(define-library-name %libvorbisfile
+  ("@VORBIS_LIBDIR@/libvorbisfile")
+  ("libvorbisfile"))
+(define-library-name %libmpg123
+  ("@MPG123_LIBDIR@/libmpg123")
+  ("libmpg123"))
+(define-library-name %libfreetype
+  ("@FREETYPE_LIBDIR@/libfreetype")
+  ("libfreetype"))
+(define-library-name %libreadline
+  ("@READLINE_LIBDIR@/libreadline")
+  ("libreadline"))
 
 (define (scope-datadir file)
   "Append the Chickadee data directory to FILE."
-- 
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