Index: configure.in
==================================================================
--- configure.in
+++ configure.in
@@ -28,11 +28,11 @@
 fi
 AC_SUBST(EXTENSION_TARGET)
 AC_SUBST(TCLEXT_BUILD)
 
 dnl Determine what SSL library to link with
-AC_ARG_WITH([ssl], AS_HELP_STRING([--with-ssl], [name of ssl library to build against (openssl, libressl, nss, auto)]), [
+AC_ARG_WITH([ssl], AS_HELP_STRING([--with-ssl=<name>], [name of ssl library to build against (openssl, libressl, nss, auto)]), [
 	if test "$withval" = "no"; then
 		AC_MSG_ERROR([You may not specify --without-ssl])
 	fi
 
 	if test "$withval" = "yes"; then