Document PG_CONFIG variable in configure --help output.

diff --git a/configure.ac b/configure.ac
index 93662e075e2b413782383c5cea42282c557c8648..19f9e7537ca56492791c5fd60f6433e3655d174b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -123,6 +123,7 @@ AC_STRUCT_TM
 # Find libpq headers and libraries\r
 #\r
 AC_PATH_PROGS(PG_CONFIG, pg_config)\r
+AC_ARG_VAR(PG_CONFIG, [path to pg_config program])\r
 if test -z "$PG_CONFIG" ; then\r
   AC_MSG_ERROR([pg_config not found])\r
 fi\r