diff --git a/configure.ac b/configure.ac
index 0c40c29c..f9dbfa4c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,8 @@ AC_PROG_CXX
 AC_PROG_CC
 
 # Checks for libraries.
-AC_CHECK_LIB(ssl, RC4)
+AC_DEFINE(_GNU_SOURCE)
+#AC_CHECK_LIB(ssl, RC4)
 PKG_CHECK_MODULES([MIST], [mist-1.0 >= 3.0.0])
 
 # Checks for header files.