diff --git a/src/cf/osconf.m4 b/src/cf/osconf.m4
index 30d7e0a57e..f5bc6c3251 100644
--- a/src/cf/osconf.m4
+++ b/src/cf/osconf.m4
@@ -1165,6 +1165,7 @@ AC_SUBST(PAM_OPTMZ)
 AC_SUBST(RANLIB)
 AC_SUBST(REGEX_OBJ)
 AC_SUBST(RM)
+AC_SUBST(RXDEBUG)
 AC_SUBST(SHLIB_CFLAGS)
 AC_SUBST(SHLIB_LDFLAGS)
 AC_SUBST(SHLIB_LINKER)
diff --git a/src/config/Makefile.config.in b/src/config/Makefile.config.in
index 3078b2d6f6..a12a9d7cea 100644
--- a/src/config/Makefile.config.in
+++ b/src/config/Makefile.config.in
@@ -72,6 +72,7 @@ PATH_CPP = @PATH_CPP@
 RANLIB = @RANLIB@
 REGEX_OBJ = @REGEX_OBJ@
 RM = @RM@
+RXDEBUG = @RXDEBUG@
 SHLIB_CFLAGS = @SHLIB_CFLAGS@
 SHLIB_LDFLAGS = @SHLIB_LDFLAGS@
 SHLIB_LINKER = @SHLIB_LINKER@