Apologies, my bad you are correct the function was defined in x509_vfy.h

Im compiling on RHEL
Red Hat Enterprise Linux Server release 7.5 (Maipo)
I have tried Openssl from source versions;
openssl-1.0.2o  (this releaseis a mess and the folder structure has been altered)
openssl-1.1.0h
openssl-1.1.0

I havce tried 
Python-3.7.0
Python-3.6.3

checking for pkg-config... /usr/bin/pkg-config
checking for openssl/ssl.h in /usr/local/ssl... no
checking for openssl/ssl.h in /usr/lib/ssl... no
checking for openssl/ssl.h in /usr/ssl... no
checking for openssl/ssl.h in /usr/pkg... no
checking for openssl/ssl.h in /usr/local... no
checking for openssl/ssl.h in /usr... no
checking whether compiling and linking against OpenSSL works... no
checking for --with-ssl-default-suites... python

My details of Setup are;

SSL=/home/{my_home_folder}/openssl
_ssl _ssl.c \
        -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
        -L$(SSL) -lssl -lcrypto

I now spot that the Linker is having issues (-L)

libssl.so & cyypt.so   is in /home/{my_home_folder}/openssl
all the header files are in;

=/home/{my_home_folder}/openssl/include/openssl

including opensslconf.h
however not of the declarations have been commented out including any of the 

DEPRECATEDIN_1_0_0  etc etc