diff --git a/configure.ac b/configure.ac
index 83be6f139..3c387976b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -167,9 +167,11 @@ AC_DEFUN([_MY_CXX_CHECK_OPT],
 # Macros work such that first option that passes is the one we take
 # gnu++14 is the newest that Verilator supports
 # std++03 is the oldest that Verilator supports
+_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++17)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++14)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++11)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++03)
+_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++17)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++14)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++11)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++03)
@@ -179,6 +181,7 @@ AC_SUBST(CFG_CXXFLAGS_STD_NEWEST)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=std++03)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=std++11)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=std++14)
+_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=std++17)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=gnu++03)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=gnu++11)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_OLDEST,-std=gnu++14)
@@ -218,6 +221,7 @@ AC_SUBST(CFG_CXXFLAGS_PARSER)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-faligned-new)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-fbracket-depth=4096)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Qunused-arguments)
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-bool-operation)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-parentheses-equality)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-sign-compare)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-uninitialized)
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index b5fe0e257..61242fb1f 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -663,7 +663,7 @@ sub compile {
     elsif ($param{vlt}) {
 	my @cmdargs = $self->compile_vlt_flags(%param);
 
-	if ($self->sc && !defined $ENV{SYSTEMC} && !defined $ENV{SYSTEMC_INCLUDE}) {
+	if ($self->sc && !$self->have_sc) {
 	    $self->skip("Test requires SystemC; ignore error since not installed\n");
 	    return 1;
 	}
@@ -911,6 +911,12 @@ sub sc {
     return $self->{sc};
 }
 
+sub have_sc {
+    #my $self = shift;
+    return 1 if (defined $ENV{SYSTEMC} || defined $ENV{SYSTEMC_INCLUDE});
+    return 0;
+}
+
 #----------------------------------------------------------------------
 
 sub run {
diff --git a/test_regress/t/t_param_public.cpp b/test_regress/t/t_param_public.cpp
index 9bf79f879..c59102b17 100644
--- a/test_regress/t/t_param_public.cpp
+++ b/test_regress/t/t_param_public.cpp
@@ -16,7 +16,7 @@ int main (int argc, char *argv[]) {
     Verilated::debug(0);
 
     // Make sure public tag worked
-    if (static_cast<bool>(Vt_param_public_p::INPACK)) {}
+    if (static_cast<int>(Vt_param_public_p::INPACK) != 0) {}
 
     for (int i = 0; i < 10; i++) {
 	topp->eval();
diff --git a/test_regress/t/t_trace_ena_sc.pl b/test_regress/t/t_trace_ena_sc.pl
index b2d4bc0c5..4f5d30882 100755
--- a/test_regress/t/t_trace_ena_sc.pl
+++ b/test_regress/t/t_trace_ena_sc.pl
@@ -7,21 +7,26 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
 
-top_filename("t/t_trace_ena.v");
+if (!$Self->have_sc) {
+    $Self->skip("No SystemC installed");
+}
+else {
+    top_filename("t/t_trace_ena.v");
 
-compile (
-    verilator_flags2 => ['-trace -sc'],
-    );
+    compile (
+        verilator_flags2 => ['-trace -sc'],
+        );
 
-execute (
-    check_finished=>1,
-    );
+    execute (
+        check_finished=>1,
+        );
 
-if ($Self->{vlt}) {
-    # Note more checks in _cc.pl
-    file_grep     ("$Self->{obj_dir}/simx.vcd", qr/\$enddefinitions/x);
+    if ($Self->{vlt}) {
+        # Note more checks in _cc.pl
+        file_grep     ("$Self->{obj_dir}/simx.vcd", qr/\$enddefinitions/x);
 
-    vcd_identical("$Self->{obj_dir}/simx.vcd", "t/$Self->{name}.out");
+        vcd_identical("$Self->{obj_dir}/simx.vcd", "t/$Self->{name}.out");
+    }
 }
 
 ok(1);
diff --git a/test_regress/t/t_verilated_all_newest.pl b/test_regress/t/t_verilated_all_newest.pl
index 7bb138b9a..6e4f5eb51 100755
--- a/test_regress/t/t_verilated_all_newest.pl
+++ b/test_regress/t/t_verilated_all_newest.pl
@@ -14,6 +14,7 @@ my $root = "..";
 compile (
     # Can't use --coverage and --savable together, so cheat and compile inline
     verilator_flags2 => ['--cc --coverage-toggle --coverage-line --coverage-user --trace --vpi $root/include/verilated_save.cpp'],
+    make_flags => 'DRIVER_STD=newest',
     );
 
 execute (
diff --git a/test_regress/t/t_vlcov_merge.pl b/test_regress/t/t_vlcov_merge.pl
index c811644bd..da25bdd87 100755
--- a/test_regress/t/t_vlcov_merge.pl
+++ b/test_regress/t/t_vlcov_merge.pl
@@ -17,5 +17,14 @@ $Self->run(cmd=>["../bin/verilator_coverage",
                  "t/t_vlcov_data_d.dat",
            ],
     );
-ok(files_identical("$Self->{obj_dir}/coverage.dat", "t/$Self->{name}.out"));
+
+# Older clib's didn't properly sort maps, but the coverage data doesn't
+# really care about ordering. So avoid false failures by sorting.
+$Self->run(cmd=>["sort",
+                 "$Self->{obj_dir}/coverage.dat",
+                 "> $Self->{obj_dir}/coverage-sort.dat",
+           ],
+    );
+
+ok(files_identical("$Self->{obj_dir}/coverage-sort.dat", "t/$Self->{name}.out"));
 1;