From 928f7a3c7e53daee99b3a27a50199192393e224f Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 7 Sep 2015 14:54:33 +0200
Subject: configure: make fontconfig optional

---
 configure.ac | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ba0f5e0..6ebaacf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,8 @@ AC_ARG_ENABLE([directwrite], AS_HELP_STRING([--disable-directwrite],
     [disable DirectWrite support (win32 only) @<:@default=check@:>@]))
 AC_ARG_ENABLE([coretext], AS_HELP_STRING([--disable-coretext],
     [disable CoreText support (OSX only) @<:@default=check@:>@]))
+AC_ARG_ENABLE([require-system-font-provider], AS_HELP_STRING([--disable-require-system-font-provider],
+    [allow compilation even if no system font provider was found @<:@default=enabled:>@]))
 AC_ARG_ENABLE([harfbuzz], AS_HELP_STRING([--disable-harfbuzz],
     [disable HarfBuzz support @<:@default=check@:>@]))
 AC_ARG_ENABLE([asm], AS_HELP_STRING([--disable-asm],
@@ -145,7 +147,7 @@ PKG_CHECK_MODULES([FONTCONFIG], fontconfig >= 2.4.2, [
     LIBS="$LIBS $FONTCONFIG_LIBS"
     AC_DEFINE(CONFIG_FONTCONFIG, 1, [found fontconfig via pkg-config])
 	fontconfig=true
-    ])
+    ], [fontconfig=false])
 fi
 
 if test x$enable_coretext != xno; then
@@ -238,6 +240,17 @@ if test x$directwrite = xtrue; then
     pkg_libs="${pkg_libs} -ldwrite"
 fi
 
+if test x$enable_require_system_font_provider != xno &&
+   test x$fontconfig != xtrue &&
+   test x$directwrite != xtrue &&
+   test x$coretext != xtrue
+then
+    AC_MSG_ERROR([\
+Either DirectWrite (on Windows), CoreText (on OSX), or Fontconfig\
+(Linux, other) is required. If you really want to compile without\
+a system font provider, add --disable-require-system-font-provider])
+fi
+
 AC_SUBST([PKG_LIBS_DEFAULT], [$(test x$enable_shared = xno && echo ${pkg_libs})])
 AC_SUBST([PKG_REQUIRES_DEFAULT], [$(test x$enable_shared = xno && echo ${pkg_requires})])
 AC_SUBST([PKG_LIBS_PRIVATE], [$(test x$enable_shared = xno || echo ${pkg_libs})])
-- 
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