--- a/autoconf/ast_check_openh323.m4
+++ b/autoconf/ast_check_openh323.m4
@@ -123,6 +123,7 @@ AC_DEFUN([AST_CHECK_OPENH323_BUILD], [
 				;;
 		esac
 		AC_MSG_RESULT(${OPENH323_BUILD})
+		OPENH323_SUFFIX="n_s"
 
 		AC_SUBST([OPENH323_SUFFIX])
 		AC_SUBST([OPENH323_BUILD])
--- a/configure.ac
+++ b/configure.ac
@@ -1317,7 +1317,7 @@ if test "${USE_PWLIB}" != "no"; then
 	if test "${HAS_PWLIB:-unset}" != "unset"; then
 		AST_CHECK_PWLIB_PLATFORM()
 
-		PLATFORM_PWLIB="pt_${PWLIB_PLATFORM}_r"
+		PLATFORM_PWLIB="pt_${PWLIB_PLATFORM}_r_s"
 
 		AST_CHECK_PWLIB_BUILD([PWLib], [PWLIB],
 			[Define if your system has the PWLib libraries.],