--- otp-OTP-21.1.1.orig/lib/crypto/c_src/crypto.c 2018-10-12 17:12:11.000000000 +0200
+++ otp-OTP-21.1.1/lib/crypto/c_src/crypto.c 2018-11-02 15:42:24.274260763 +0100
@@ -168,7 +168,8 @@
#if OPENSSL_VERSION_NUMBER >= PACKED_OPENSSL_VERSION(0,9,8,'o') \
&& !defined(OPENSSL_NO_EC) \
&& !defined(OPENSSL_NO_ECDH) \
- && !defined(OPENSSL_NO_ECDSA)
+ && !defined(OPENSSL_NO_ECDSA) \
+ && !defined(OPENSSL_NO_EC2M)
# define HAVE_EC
#endif