Compilation fails: SSL_TXT_SSLV2 not defined

[Muffinman]

Hello all,

I'm trying to compile dovecot 2.2.21 on OS-X 10.11.3 and I'm running a
bit of trouble with OpenSSL. I've cloned OpenSSL (OpenSSL
1.1.0-pre4-dev) from github and in openssl/ssl.h SSL_TXT_SSLV2 is not
defined anymore. Compilation fails with:

libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../.. -I../../src/lib
-I../../src/lib-test -DMODULE_DIR=\"/usr/local/lib/dovecot\" -std=gnu99
-g -O2 -Wall -W -Wmissing-prototypes -Wmissing-declarations
-Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast
-Wno-duplicate-decl-specifier -Wstrict-aliasing=2 -MT
iostream-openssl-common.lo -MD -MP -MF .deps/iostream-openssl-common.Tpo
-c iostream-openssl-common.c  -fno-common -DPIC -o
.libs/iostream-openssl-common.o
iostream-openssl-common.c:34:24: error: use of undeclared identifier
'SSL_TXT_SSLV2'
                if (strcasecmp(name, SSL_TXT_SSLV2) == 0)
                                     ^
1 error generated.
make[3]: *** [iostream-openssl-common.lo] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

In openssl/ssl.h the following is defined:

# define SSL_TXT_SSLV3           "SSLv3"
# define SSL_TXT_TLSV1           "TLSv1"
# define SSL_TXT_TLSV1_1         "TLSv1.1"
# define SSL_TXT_TLSV1_2         "TLSv1.2"

# define SSL_TXT_ALL             "ALL"

Any suggestions on how to fix this?

Kind regards, Maarten