Add --with-coretext
Defaults to no.
diff --git a/configure.ac b/configure.ac
index 7d6a750..bf213df 100644
--- a/configure.ac
+++ b/configure.ac
@@ -296,7 +296,17 @@
dnl ===========================================================================
-AC_CHECK_TYPE(CTFontRef, have_coretext=true, have_coretext=false, [#include <ApplicationServices/ApplicationServices.h>])
+AC_ARG_WITH(coretext,
+ [AS_HELP_STRING([--with-coretext=@<:@yes/no/auto@:>@],
+ [Use CoreText @<:@default=no@:>@])],,
+ [with_coretext=no])
+have_coretext=false
+if test "x$with_coretext" = "xyes" -o "x$with_coretext" = "xauto"; then
+ AC_CHECK_TYPE(CTFontRef, have_coretext=true,, [#include <ApplicationServices/ApplicationServices.h>])
+fi
+if test "x$with_coretext" = "xyes" -a "x$have_coretext" != "xtrue"; then
+ AC_MSG_ERROR([CoreText support requested but libcoretext not found])
+fi
if $have_coretext; then
CORETEXT_CFLAGS=
CORETEXT_LIBS="-framework ApplicationServices"
