> .. but it's usually faster to check the configure.in, aclocal.m4 
> and acinclude.m4 files for the appropriate sections. 

A little easier ;-> But, somebody smarter will still have to the correct 
decisions for me, er htdig.  acinclude.m4 (which is a shorter version of 
aclocal.m4?? at least the SSL section is the same) works on HAVE_SSL but 
it appears that's not used in the code, HAVE_SSL_H is. As importantly 
htnet/SSL*.cc is where the ssl work is needed and that uses C++ and so 
CXXFLAGS.  Finally, the #includes in the htnet/SSL*.cc code are all:
#ifdef HAVE_SSL_H
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

which means they're assuming openssl and want an include path of 
/usr/local/ssl.  The m4 routine:
AC_DEFUN([CHECK_SSL],
[AC_MSG_CHECKING(if ssl is wanted)
AC_ARG_WITH(ssl,
[  --with-ssl enable ssl [will check /usr/local/ssl
                            /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr 
]
],
[   AC_MSG_RESULT(yes)
    for dir in $withval /usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg 
/usr/local
 /usr; do
        ssldir="$dir"
        if test -f "$dir/include/openssl/ssl.h"; then
            found_ssl="yes";
            CFLAGS="$CFLAGS -I$ssldir/include/openssl -DHAVE_SSL";
            break;
        fi
        if test -f "$dir/include/ssl.h"; then
            found_ssl="yes";
            CFLAGS="$CFLAGS -I$ssldir/include/ -DHAVE_SSL";
            break
        fi
    done
    if test x_$found_ssl != x_yes; then
        AC_MSG_ERROR(Cannot find ssl libraries)
    else
        printf "OpenSSL found in $ssldir\n";
        LIBS="$LIBS -lssl -lcrypto";
        LDFLAGS="$LDFLAGS -L$ssldir/lib";
        HAVE_SSL=yes
    fi
    AC_SUBST(HAVE_SSL)
],
[
    AC_MSG_RESULT(no)
])
])


so change HAVE_SSL to HAVE_SSL_H and change:
            CFLAGS="$CFLAGS -I$ssldir/include/ -DHAVE_SSL";
to:
            CXXFLAGS="$CXXFLAGS -I$ssldir/include/ -DHAVE_SSL_H";

though its probably better to change the htnet/SSL*cc stuff to use:
#include <ssl.h>

if you want to keep the -I$ssldir/include/ vs -I$ssldir/include/openssl

or is that a six/half dozen thing?


> make distclean 

This would be an automake bug. What do the top of the Makefile.in files
say? (I want to be sure it's the original CVS version and not regenerated
on your system.)

# Makefile.in generated by automake 1.6.3 from Makefile.am.
# @configure_input@

here's the chunk from Makefile.in
#
# If --enable-tests is not specified, should remove
# the test/Makefile anyway
#
distclean-local:
        if "X$(TESTDIR)" = "Xtest" ; \
        then \
                rm -f test/Makefile test/test_functions ; \
        fi

It seems to be missing the 'test' sh cmd (and 'X' is an executable prog):
#
# If --enable-tests is not specified, should remove
# the test/Makefile anyway
#
distclean-local:
        if test "X$(TESTDIR)" = "Xtest" ; \
        then \
                rm -f test/Makefile test/test_functions ; \
        fi





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