From 46a5952de18f4585dac2a2b0962c269344c62be4 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Wed, 20 Feb 2013 06:37:07 -0500
Subject: Improve build system.

---
(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 16e4ced..15a3d6d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,16 +8,16 @@ AM_PROG_CC_C_O()
 
 AC_C_INLINE()
 
-AC_CHECK_HEADERS([stdlib.h])
-AC_CHECK_HEADERS([string.h])
-AC_CHECK_HEADERS([inttypes.h])
+AC_CHECK_HEADERS([stdlib.h string.h inttypes.h],
+	[],
+	[AC_MSG_ERROR([cannot find or include standard C library headers])])
 
 AC_TYPE_SIZE_T()
 
 AC_FUNC_MALLOC()
-AC_CHECK_FUNCS([memset])
-AC_CHECK_FUNCS([strdup])
-AC_CHECK_FUNCS([strndup])
+AC_CHECK_FUNCS([memset strdup strndup],
+	[],
+	[AC_MSG_ERROR([cannot find standard C library functions])])
 
 PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES([SDL], [sdl])
@@ -25,6 +25,14 @@ PKG_CHECK_MODULES([SDL_IMAGE], [SDL_image])
 PKG_CHECK_MODULES([ZLIB], [zlib])
 PKG_CHECK_MODULES([EXPAT], [expat])
 
+AC_ARG_VAR([XCF2PNG], [path to xcf2png utility])
+AC_CHECK_PROGS([XCF2PNG], [xcf2png], [no])
+if test "x$XCF2PNG" = "xno"; then
+	AC_MSG_ERROR(
+[cannot find xcf2png
+xcftools may need to be installed.])
+fi
+
 if test "x$GCC" = "xyes"; then
 	GCC_CFLAGS="-pedantic -Wall -Wextra -Werror"
 	GCC_CFLAGS="${GCC_CFLAGS} -Wformat=2 -Wswitch -Wswitch-enum"
--
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