diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
index 54f51f7ad..8c6c42276 100644
--- a/docs/CONTRIBUTORS
+++ b/docs/CONTRIBUTORS
@@ -38,3 +38,4 @@ Todd Strader
 Wilson Snyder
 Yutetsu TAKATSUKASA
 Yves Mathieu
+David Stanford
diff --git a/docs/install.adoc b/docs/install.adoc
index d71f8d6e8..09a74c516 100644
--- a/docs/install.adoc
+++ b/docs/install.adoc
@@ -98,9 +98,11 @@ Additionally, to build or run Verilator you need these standard packages:
 
 Those developing Verilator may also want these (see internals.adoc):
 
-   sudo apt-get install gdb asciidoctor graphviz
+   sudo apt-get install gdb asciidoctor graphviz cmake
    cpan install Pod::Perldoc
    cpan install Unix::Processors
+   cpan install Parallel::Forker
+   cpan install Bit::Vector
 
 ==== Install SystemC
 
diff --git a/docs/internals.adoc b/docs/internals.adoc
index 94edaf247..55d5e407a 100644
--- a/docs/internals.adoc
+++ b/docs/internals.adoc
@@ -625,6 +625,10 @@ with e.g. "sudo cpan install Parallel::Forker".
 * vcddiff to find differences in VCD outputs. See the readme at
 https://github.com/veripool/vcddiff
 
+* Cmake for build paths that use it.
+
+* Bit::Vector to test vgen.pl
+
 === Controlling the Test Driver
 
 Test drivers are written in PERL. All invoke the main test driver script,
diff --git a/test_regress/t/t_flag_make_cmake.pl b/test_regress/t/t_flag_make_cmake.pl
index be0628665..37ec87826 100755
--- a/test_regress/t/t_flag_make_cmake.pl
+++ b/test_regress/t/t_flag_make_cmake.pl
@@ -7,6 +7,7 @@ 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.
 
+
 scenarios(simulator => 1);
 
 compile(
@@ -14,15 +15,18 @@ compile(
     verilator_make_cmake => 1,
     );
 
+system("cmake --version");
+if ($? != 0) {
+    skip("cmake is not installed");
+} else {
+    my $cmakecache = $Self->{obj_dir}."/CMakeCache.txt";
+    if (! -e $cmakecache) {
+	error("$cmakecache does not exist.")
+    }
 
-my $cmakecache = $Self->{obj_dir}."/CMakeCache.txt";
-if (! -e $cmakecache) {
-    error("$cmakecache does not exist")
+    execute(
+	check_finished => 1,
+	);
 }
-
-execute(
-    check_finished => 1,
-    );
-
 ok(1);
 1;
diff --git a/test_regress/t/t_vgen.pl b/test_regress/t/t_vgen.pl
index 6ebbec5f2..16b665aa1 100755
--- a/test_regress/t/t_vgen.pl
+++ b/test_regress/t/t_vgen.pl
@@ -9,21 +9,23 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 
 scenarios(simulator => 1);
 
-if (eval "use Bit::Vector; return 2;" != 2) { error("Please install Bit::Vector"); }
+if (eval "use Bit::Vector; return 2;" != 2) {
+    skip("Vgen test requires Bit::Vector");
+} else {
 
-top_filename("$Self->{obj_dir}/vgen.v");
+    top_filename("$Self->{obj_dir}/vgen.v");
 
-run(cmd => ["./vgen.pl",
-            "-o $Self->{top_filename}",
-            #"--seed 0",
-           ]);
+    run(cmd => ["./vgen.pl",
+        "-o $Self->{top_filename}",
+        #"--seed 0",
+    ]);
 
-compile(
+    compile(
     );
 
-execute(
+    execute(
     check_finished => 1,
     );
-
+}
 ok(1);
 1;