Build of squid 4.0.23 on current Debian 9 report the single_dh_use as not known.
Older build of squid 3.5.21 on Debian 8 doesn't report it.
According the documentation [1] it should be known and supported.

[1] http://www.squid-cache.org/Doc/config/http_port/

Is it a bug?

Peter

$ /usr/sbin/squid -v
Squid Cache: Version 4.0.23
Service Name: squid
Squid built with SSLBump

This binary uses OpenSSL 1.1.0f  25 May 2017. For legal restrictions
on distribution see https://www.openssl.org/source/license.html

configure options:  '--build=x86_64-linux-gnu' '--prefix=/usr'
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' '--sysconfdir=/etc'
'--localstatedir=/var' '--libexecdir=${prefix}/lib/squid' '--srcdir=.'
'--disable-maintainer-mode' '--disable-dependency-tracking'
'--disable-silent-rules' 'BUILDCXXFLAGS=-g -O2
-fdebug-prefix-map=/build/squid-4.0.23=. -fstack-protector-strong
-Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2
-Wl,-z,relro -Wl,-z,now -Wl,--as-needed' '--enable-build-info=Debian
linux' '--datadir=/usr/share/squid' '--sysconfdir=/etc/squid'
'--libexecdir=/usr/lib/squid' '--runstatedir=/var/run/squid'
'--mandir=/usr/share/man' '--enable-inline' '--disable-arch-native'
'--disable-loadable-modules' '--enable-storeio=aufs,rock'
'--enable-removal-policies=lru,heap' '--enable-delay-pools'
'--enable-cache-digests' '--enable-icap-client'
'--enable-follow-x-forwarded-for' '--enable-auth'
'--enable-external-acl-helpers=file_userip,session,SQL_session,time_quota,unix_group'
'--enable-security-cert-validators=fake'
'--enable-storeid-rewrite-helpers=file'
'--enable-url-rewrite-helpers=fake' '--enable-eui' '--disable-esi'
'--enable-icmp' '--enable-zph-qos' '--disable-ecap'
'--disable-translation' '--disable-ident-lookups'
'--with-swapdir=/var/spool/squid' '--with-logdir=/var/log/squid'
'--with-pidfile=/var/run/squid/squid.pid'
'--with-filedescriptors=65536' '--with-large-files'
'--with-default-user=proxy' '--enable-security-cert-generators=file'
'--enable-ssl-crtd' '--with-openssl' '--without-mit-krb5'
'--without-heimdal-krb5' '--disable-wccp' '--disable-wccpv2'
'--disable-ipv6' '--enable-build-info=Squid built with SSLBump'
'--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g
-O2 -fdebug-prefix-map=/build/squid-4.0.23=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro
-Wl,-z,now -Wl,--as-needed' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/squid-4.0.23=.
-fstack-protector-strong -Wformat -Werror=format-security'

$ /usr/sbin/squid -k parse -d 9 -n test
2018/02/14 13:33:41| Startup: Initializing Authentication Schemes ...
2018/02/14 13:33:41| Startup: Initialized Authentication Scheme 'basic'
2018/02/14 13:33:41| Startup: Initialized Authentication Scheme 'digest'
2018/02/14 13:33:41| Startup: Initialized Authentication Scheme 'negotiate'
2018/02/14 13:33:41| Startup: Initialized Authentication Scheme 'ntlm'
2018/02/14 13:33:41| Startup: Initialized Authentication.
2018/02/14 13:33:41| WARNING: BCP 177 violation. IPv6 transport forced
OFF by build parameters.
2018/02/14 13:33:41| Processing Configuration File:
/etc/squid/squid.conf (depth 0)
2018/02/14 13:33:41| Processing: acl localnet src 10.0.0.0/8
 # RFC 1918 local private network (LAN)
2018/02/14 13:33:41| Processing: acl SSL_ports port 443 990
2018/02/14 13:33:41| Processing: acl Safe_ports port 80         # http
2018/02/14 13:33:41| Processing: acl Safe_ports port 21         # ftp
2018/02/14 13:33:41| Processing: acl Safe_ports port 443                # https
2018/02/14 13:33:41| Processing: acl Safe_ports port 70         # gopher
2018/02/14 13:33:41| Processing: acl Safe_ports port 210                # wais
2018/02/14 13:33:41| Processing: acl Safe_ports port 1025-65535 #
unregistered ports
2018/02/14 13:33:41| Processing: acl Safe_ports port 280
 # http-mgmt
2018/02/14 13:33:41| Processing: acl Safe_ports port 488
 # gss-http
2018/02/14 13:33:41| Processing: acl Safe_ports port 591
 # filemaker
2018/02/14 13:33:41| Processing: acl Safe_ports port 777
 # multiling http
2018/02/14 13:33:41| Processing: acl Safe_ports port 990                # ftps
2018/02/14 13:33:41| Processing: acl CONNECT method CONNECT
2018/02/14 13:33:41| Processing: acl purge method PURGE
2018/02/14 13:33:41| Processing: http_access deny !Safe_ports
2018/02/14 13:33:41| Processing: http_access deny CONNECT !SSL_ports
2018/02/14 13:33:41| Processing: http_access allow localhost manager
2018/02/14 13:33:41| Processing: http_access deny manager
2018/02/14 13:33:41| Processing: http_access allow localhost purge
2018/02/14 13:33:41| Processing: http_access deny purge
2018/02/14 13:33:41| Processing: http_access allow localhost
2018/02/14 13:33:41| Processing: http_access deny all
2018/02/14 13:33:41| Processing: include /etc/squid/conf.d/test-http_port.conf
2018/02/14 13:33:41| Processing Configuration File:
/etc/squid/conf.d/test-http_port.conf (depth 1)
2018/02/14 13:33:41| Processing: http_port 8080 ssl-bump name=test
options=NO_SSLv3 cert=/etc/squid/cert/serverproxyCA.pem
generate-host-certificates=on tls-default-ca=off
options=SINGLE_DH_USE:SINGLE_ECDH_USE
tls-dh=/etc/squid/cert/dhparam.pem
sslflags=NO_SESSION_REUSE:VERIFY_CRL
cipher=EDH+aRSA+AESGCM:EDH+aRSA+AES:DHE-RSA-AES256-SHA:EECDH+aRSA+AESGCM:EECDH+aRSA+AES:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:RSA+AESGCM:RSA+AES+SHA:DES-CBC3-SHA:DHE-RSA-AES128-SHA
2018/02/14 13:33:41| ERROR: Unknown TLS option SINGLE_DH_USE
2018/02/14 13:33:41| ERROR: Unknown TLS option SINGLE_ECDH_USE
.....
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