diff --git a/aclocal/ax_thrift_gen.m4 b/aclocal/ax_thrift_gen.m4
new file mode 100644
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+++ b/aclocal/ax_thrift_gen.m4
@@ -0,0 +1,22 @@
+dnl @synopsis AX_THRIFT_GEN(SHORT_LANGUAGE, LONG_LANGUAGE, DEFAULT)
+dnl
+dnl Allow a particular language generator to be disabled.
+dnl
+dnl This macro has poor error handling and is poorly documented.
+dnl It is intended only for internal use by the Thrift compiler.
+dnl
+dnl @author David Reiss <dreiss@facebook.com>
+dnl @version 2008-02-20
+dnl @license AllPermissive
+
+AC_DEFUN([AX_THRIFT_GEN],
+         [
+          AC_ARG_ENABLE([gen-$1],
+                        AC_HELP_STRING([--enable-gen-$1], [Enable the $2 compiler.  Default is $3]),
+                        [ax_thrift_gen_$1="$enableval"],
+                        [ax_thrift_gen_$1=$3]
+                        )
+          dnl I'd like to run the AM_CONDITIONAL here, but automake likes
+          dnl all AM_CONDITIONALs to be nice and explicit in configure.ac.
+          dnl AM_CONDITIONAL([THRIFT_GEN_$1], [test "$ax_thrift_gen_$1" = "yes"])
+         ])