From c405b463a00c719e015f30a8a7da4db787736560 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Fri, 17 Dec 2021 08:57:01 -0500
Subject: Add libpng bindings.

---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 61fd8d3..b4cd56d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,20 @@ GUILE_PROGS
 GUILE_MODULE_REQUIRED([gl])
 GUILE_MODULE_REQUIRED([sdl2])
 
+AC_PATH_PROGS([PKG_CONFIG], [pkg-config])
+
+PKG_CHECK_MODULES([PNG], [libpng])
+PKG_CHECK_VAR([PNG_LIBDIR], [libpng], [libdir])
+AC_MSG_CHECKING([libpng library path])
+AS_IF([test "PNG_LIBDIR" = "x"], [
+  AC_MSG_FAILURE([Unable to identify libpng lib path.])
+], [
+  AC_MSG_RESULT([$PNG_LIBDIR])
+])
+AC_SUBST([PNG_LIBDIR])
+PNG_VERSION="`$PKG_CONFIG --modversion libpng`"
+AC_SUBST([PNG_VERSION])
+
 PKG_CHECK_MODULES([TURBOJPEG], [libturbojpeg])
 PKG_CHECK_VAR([TURBOJPEG_LIBDIR], [libturbojpeg], [libdir])
 AC_MSG_CHECKING([libturbojpeg library path])
-- 
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