proc check-for-openssl {msg {cflags {}}} {
    msg-checking "Checking for $msg..."
    set rc 0
    set libs {-lssl -lcrypto}
    if {[is_mingw]} {
        lappend libs -lgdi32 -lwsock32
    }
    if {[info exists ::zlib_for_ssl]} {
        lappend libs $::zlib_for_ssl
    }
    msg-quiet cc-with [list -cflags $cflags -libs $libs] {
        if {[cc-check-includes openssl/ssl.h] && [cc-check-functions SSL_new]} {
            incr rc
        }
    }

    define FOSSIL_ENABLE_MINIZ 1
    msg-result "Using miniz for compression"
} else {
    # Check for zlib, using the given location if specified
    set zlibpath [opt-val with-zlib]
    if {$zlibpath eq "tree"} {
        set zlibdir [file dirname $autosetup(dir)]/compat/zlib
        if {![file isdirectory $zlibdir]} {
            user-error "The zlib in source tree directory does not exist"
        }
        cc-with [list -cflags "-I$zlibdir -L$zlibdir"]
        define-append EXTRA_CFLAGS -I$zlibdir
        define-append LIBS $zlibdir/libz.a
        set ::zlib_for_ssl $zlibdir/libz.a
        msg-result "Using zlib in source tree"
    } else {
        if {$zlibpath ni {auto ""}} {

if {$ssldirs ne "none"} {
    if {[opt-bool with-miniz]} {
        user-error "The --with-miniz option is incompatible with OpenSSL"
    }
    set found 0
    if {$ssldirs eq "tree"} {
        set ssldir [file dirname $autosetup(dir)]/compat/openssl
        if {![file isdirectory $ssldir]} {
            user-error "The OpenSSL in source tree directory does not exist"
        }
        set msg "ssl in $ssldir"
        set cflags "-I$ssldir/include"
        set ldflags "-L$ssldir"
        set found [check-for-openssl "ssl in source tree" "$cflags $ldflags"]
    } else {
        if {$ssldirs in {auto ""}} {
            catch {