diff --git a/Makefile.in b/Makefile.in
index b03cf9a37..0622509e5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -87,6 +87,9 @@ pkgdatadir = @pkgdatadir@
 # Directory in which to install data across multiple architectures
 datarootdir = @datarootdir@
 
+# Compile options
+CFG_WITH_DEFENV = @CFG_WITH_DEFENV@
+
 #### End of system configuration section. ####
 ######################################################################
 
@@ -271,6 +274,10 @@ install-project: dist
 	rm $(DISTNAME).tgz
 
 install-project-quick:
+ifeq ($(CFG_WITH_DEFENV),yes)
+	@echo "%Error: Reconfigure with './configure --disable-defenv' to avoid hardcoded paths."
+	false
+endif
 	@echo "Install-project-quick (no strip) to $(DIRPROJECT)"
 	for p in $(INST_PROJ_FILES) ; do \
 	  $(INST_PROJ_CVS) $$p $(DIRPROJECT)/hw/utils/verilator/$$p; \
diff --git a/bin/verilator b/bin/verilator
index afecc2a2c..76d5b120a 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -18,9 +18,9 @@ eval 'exec perl -wS $0 ${1+"$@"}'
 require 5.006_001;
 use warnings;
 BEGIN {
-    if (my $Project=($ENV{DIRPROJECT}||$ENV{PROJECT})) {
+    if ($ENV{DIRPROJECT} && $ENV{DIRPROJECT_PERL_BOOT}) {
 	# Magic to allow author testing of perl packages in local directory
-	require "$Project/hw/utils/perltools/boot.pl";
+	require $ENV{DIRPROJECT}."/".$ENV{DIRPROJECT_PERL_BOOT};
     }
 }
 
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 2f57d1279..bb7589f0a 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -369,17 +369,6 @@ string V3Options::getenvSYSTEMPERLGuts() {
 	var = DEFENV_SYSTEMPERL;
 	setenvStr("SYSTEMPERL", var, "Hardcoded at build time");
     }
-    // Only correct or check it if we really need the value
-    if (v3Global.opt.usingSystemPerlLibs()) {
-	if (var == "") {
-	    string testdir = V3Options::getenvW() + "/hw/utils/perltools/SystemC"; // Hack for internal testing
-	    if (V3Options::fileStatDir(testdir)) {
-		var = testdir;
-		setenvStr ("SYSTEMPERL", var, "From W");
-	    }
-	}
-	// Test for correctness in SYSTEMPERL_INCLUDE
-    }
     return var;
 }
 
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 516505251..f1060b065 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -4,9 +4,9 @@
 
 require 5.006_001;
 BEGIN {
-    if (my $Project=($ENV{DIRPROJECT}||$ENV{PROJECT})) {
+    if ($ENV{DIRPROJECT} && $ENV{DIRPROJECT_PERL_BOOT}) {
 	# Magic to allow author testing of perl packages in local directory
-	require "$Project/hw/utils/perltools/boot.pl";
+	require $ENV{DIRPROJECT}."/".$ENV{DIRPROJECT_PERL_BOOT};
     }
 }