-PKG_CHECK_MODULES([OPENSSL], [libcrypto], [], [:])
+AC_ARG_ENABLE(openssl,
+ [ --disable-openssl do not use openssl even when it is present],
+ [], [enable_openssl=yes]
+)
+AS_IF([test "x$enable_openssl" = "xyes"], [
+ PKG_CHECK_MODULES([OPENSSL], [libcrypto], [], [:])
+])