diff --git a/include/verilated.cpp b/include/verilated.cpp
index a43b00c6b..c3f44dbde 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -72,7 +72,7 @@
 # include <execinfo.h>
 # define _VL_HAVE_STACKTRACE
 #endif
-#if defined(__linux) || (defined(__APPLE__) && defined(__MACH__))
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 # include <sys/time.h>
 # include <sys/resource.h>
 # define _VL_HAVE_GETRLIMIT
diff --git a/test_regress/driver.py b/test_regress/driver.py
index 5c6f2d8de..6c0573b0a 100755
--- a/test_regress/driver.py
+++ b/test_regress/driver.py
@@ -2809,6 +2809,7 @@ if __name__ == '__main__':
     if 'TEST_REGRESS' in os.environ:
         sys.exit("%Error: TEST_REGRESS environment variable is already set")
     os.environ['TEST_REGRESS'] = os.getcwd()
+    os.environ['TERM'] = "dumb"
 
     Start = time.time()
     _Parameter_Next_Level = None
diff --git a/test_regress/t/t_ccache_report.py b/test_regress/t/t_ccache_report.py
index 40d5882b9..6109fa46b 100755
--- a/test_regress/t/t_ccache_report.py
+++ b/test_regress/t/t_ccache_report.py
@@ -31,8 +31,8 @@ test.files_identical(report, "t/" + test.name + "__ccache_report_initial.out")
 # Now rebuild again (should be all up to date)
 test.run(logfile=test.obj_dir + "/rebuild.log",
          cmd=[
-             "make", "-C " + test.obj_dir, "-f " + test.vm_prefix + ".mk", test.vm_prefix,
-             "ccache-report"
+             os.environ["MAKE"], "-C " + test.obj_dir, "-f " + test.vm_prefix + ".mk",
+             test.vm_prefix, "ccache-report"
          ])
 
 test.files_identical(report, "t/" + test.name + "__ccache_report_rebuild.out")
diff --git a/test_regress/t/t_dist_lint_py.py b/test_regress/t/t_dist_lint_py.py
index 8c8b9a2f6..f011fb1f8 100755
--- a/test_regress/t/t_dist_lint_py.py
+++ b/test_regress/t/t_dist_lint_py.py
@@ -18,6 +18,6 @@ if 'VERILATOR_TEST_NO_LINT_PY' in os.environ:
 if not os.path.exists(root + "/.git"):
     test.skip("Not in a git repository")
 
-test.run(cmd=["cd " + root + " && make lint-py"])
+test.run(cmd=["cd " + root + " && " + os.environ["MAKE"] + " lint-py"])
 
 test.passes()
diff --git a/test_regress/t/t_gantt_numa.py b/test_regress/t/t_gantt_numa.py
index 39651ecf0..db25d0d87 100755
--- a/test_regress/t/t_gantt_numa.py
+++ b/test_regress/t/t_gantt_numa.py
@@ -38,7 +38,7 @@ for trial in range(0, trials):
     ])
 
     test.file_grep(gantt_log, r'CPU info:')
-    test.file_grep(gantt_log, r'NUMA status += assigned')
+    test.file_grep(gantt_log, r'NUMA status += (assigned|%Warning: no /proc/cpuinfo)')
     # False fails occasionally
     # test.file_grep_not(gantt_log, r'%Warning:')  # e.g. There were fewer CPUs (1) than threads (3).
 
diff --git a/test_regress/t/t_prof.py b/test_regress/t/t_prof.py
index e5ebf6147..429e6a0ac 100755
--- a/test_regress/t/t_prof.py
+++ b/test_regress/t/t_prof.py
@@ -14,6 +14,8 @@ test.scenarios('vlt_all')
 
 if re.search(r'clang', test.cxx_version) and 'aarch64' in platform.processor():
     test.skip("Known compiler profile issues on clang aarch64")
+if platform.libc_ver()[0] != "glibc":
+    test.skip("The test depends on GMON_OUT_PREFIX which is glibc-specific")
 
 test.compile(verilator_flags2=["--stats --prof-cfuncs +define+T_PROF"])
 
diff --git a/test_regress/t/t_prof_timing.py b/test_regress/t/t_prof_timing.py
index 59f233265..6f3f7a570 100755
--- a/test_regress/t/t_prof_timing.py
+++ b/test_regress/t/t_prof_timing.py
@@ -15,6 +15,8 @@ test.top_filename = "t/t_prof.v"
 
 if re.search(r'clang', test.cxx_version) and 'aarch64' in platform.processor():
     test.skip("Known compiler profile issues on clang aarch64")
+if platform.libc_ver()[0] != "glibc":
+    test.skip("The test depends on GMON_OUT_PREFIX which is glibc-specific")
 
 # TODO below might no longer be required as configure checks for -pg
 if 'VERILATOR_TEST_NO_GPROF' in os.environ:
diff --git a/test_regress/t/t_profc.py b/test_regress/t/t_profc.py
index 74f928bb9..a70fca363 100755
--- a/test_regress/t/t_profc.py
+++ b/test_regress/t/t_profc.py
@@ -8,10 +8,16 @@
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 import vltest_bootstrap
+import platform
 
 test.scenarios('vlt')
 test.top_filename = "t_prof.v"
 
+if re.search(r'clang', test.cxx_version) and 'aarch64' in platform.processor():
+    test.skip("Known compiler profile issues on clang aarch64")
+if platform.libc_ver()[0] != "glibc":
+    test.skip("The test depends on GMON_OUT_PREFIX which is glibc-specific")
+
 test.compile(verilator_flags2=["--stats --prof-c +define+T_PROF"])
 
 # TODO below might no longer be required as configure checks for -pg
diff --git a/test_regress/t/t_trace_two_dump_cc.py b/test_regress/t/t_trace_two_dump_cc.py
index 7536b0171..a51b7661e 100755
--- a/test_regress/t/t_trace_two_dump_cc.py
+++ b/test_regress/t/t_trace_two_dump_cc.py
@@ -20,9 +20,11 @@ test.compile(make_main=False,
              vm_prefix='Vt_trace_two_b',
              verilator_flags2=['-trace'])
 
-test.run(
-    logfile=test.obj_dir + "/make_first_ALL.log",
-    cmd=["make", "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+test.run(logfile=test.obj_dir + "/make_first_ALL.log",
+         cmd=[
+             os.environ["MAKE"], "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_dump_sc.py b/test_regress/t/t_trace_two_dump_sc.py
index 2f28b7607..00db26b57 100755
--- a/test_regress/t/t_trace_two_dump_sc.py
+++ b/test_regress/t/t_trace_two_dump_sc.py
@@ -23,7 +23,10 @@ test.compile(make_main=False,
              verilator_flags2=['-sc -trace'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_dumpfst_cc.py b/test_regress/t/t_trace_two_dumpfst_cc.py
index 809dbc452..625f3c8ac 100755
--- a/test_regress/t/t_trace_two_dumpfst_cc.py
+++ b/test_regress/t/t_trace_two_dumpfst_cc.py
@@ -21,7 +21,10 @@ test.compile(make_main=False,
              verilator_flags2=['--trace-fst --trace-threads 1 -DTEST_FST'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(
     make_main=False,
diff --git a/test_regress/t/t_trace_two_hdr_cc.py b/test_regress/t/t_trace_two_hdr_cc.py
index 77ad85f64..a6212983e 100755
--- a/test_regress/t/t_trace_two_hdr_cc.py
+++ b/test_regress/t/t_trace_two_hdr_cc.py
@@ -21,7 +21,10 @@ test.compile(make_main=False,
              verilator_flags2=['-trace'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_hdr_sc.py b/test_regress/t/t_trace_two_hdr_sc.py
index ebd1ddb6e..f189d58f0 100755
--- a/test_regress/t/t_trace_two_hdr_sc.py
+++ b/test_regress/t/t_trace_two_hdr_sc.py
@@ -23,7 +23,10 @@ test.compile(make_main=False,
              verilator_flags2=['-sc -trace'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_hdrfst_cc.py b/test_regress/t/t_trace_two_hdrfst_cc.py
index 0817439d8..3836a14ad 100755
--- a/test_regress/t/t_trace_two_hdrfst_cc.py
+++ b/test_regress/t/t_trace_two_hdrfst_cc.py
@@ -20,9 +20,11 @@ test.compile(make_main=False,
              vm_prefix='Vt_trace_two_b',
              verilator_flags2=['--trace-fst --trace-threads 1'])
 
-test.run(
-    logfile=test.obj_dir + "/make_first_ALL.log",
-    cmd=["make", "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+test.run(logfile=test.obj_dir + "/make_first_ALL.log",
+         cmd=[
+             os.environ["MAKE"], "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(
     make_main=False,
diff --git a/test_regress/t/t_trace_two_port_cc.py b/test_regress/t/t_trace_two_port_cc.py
index 9ada6cf8e..e4317efaa 100755
--- a/test_regress/t/t_trace_two_port_cc.py
+++ b/test_regress/t/t_trace_two_port_cc.py
@@ -21,7 +21,10 @@ test.compile(make_main=False,
              verilator_flags2=['-trace'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_port_sc.py b/test_regress/t/t_trace_two_port_sc.py
index 239f3e938..b26f20592 100755
--- a/test_regress/t/t_trace_two_port_sc.py
+++ b/test_regress/t/t_trace_two_port_sc.py
@@ -24,7 +24,10 @@ test.compile(make_main=False,
              verilator_flags2=['-sc -trace'])
 
 test.run(logfile=test.obj_dir + "/make_first_ALL.log",
-         cmd=["make", "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+         cmd=[
+             os.environ["MAKE"], "-C", test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(make_main=False,
              top_filename='t_trace_two_a.v',
diff --git a/test_regress/t/t_trace_two_portfst_cc.py b/test_regress/t/t_trace_two_portfst_cc.py
index 470301806..b1048f6a9 100755
--- a/test_regress/t/t_trace_two_portfst_cc.py
+++ b/test_regress/t/t_trace_two_portfst_cc.py
@@ -20,9 +20,11 @@ test.compile(make_main=False,
              vm_prefix='Vt_trace_two_b',
              verilator_flags2=['--trace-fst --trace-threads 1'])
 
-test.run(
-    logfile=test.obj_dir + "/make_first_ALL.log",
-    cmd=["make", "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk", "Vt_trace_two_b__ALL.cpp"])
+test.run(logfile=test.obj_dir + "/make_first_ALL.log",
+         cmd=[
+             os.environ["MAKE"], "-C", "" + test.obj_dir, "-f", "Vt_trace_two_b.mk",
+             "Vt_trace_two_b__ALL.cpp"
+         ])
 
 test.compile(
     make_main=False,