diff --git a/tools/bootstrap b/tools/bootstrap
old mode 100644
new mode 100755
index 768aae5..54720d1
--- a/tools/bootstrap
+++ b/tools/bootstrap
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -s
+#!/usr/bin/env perl -s
 #
 # bootstrap -- Simpler version of unmunge for bootstrapping
 #
diff --git a/tools/bootstrap2 b/tools/bootstrap2
old mode 100644
new mode 100755
index 4bba127..af7ced6
--- a/tools/bootstrap2
+++ b/tools/bootstrap2
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -s
+#!/usr/bin/env perl -s
 #
 # bootstrap2 -- Second stage bootstrapper, a version of unmunge
 #
diff --git a/tools/makemanifest b/tools/makemanifest
old mode 100644
new mode 100755
index 4e8dcc8..3752c1d
--- a/tools/makemanifest
+++ b/tools/makemanifest
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 $fileNum = 0;
 while(<>)
diff --git a/tools/psgen b/tools/psgen
old mode 100644
new mode 100755
index 2848390..f3309a8
--- a/tools/psgen
+++ b/tools/psgen
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # psgen -- Postscript generator for code portion of source books
 #
diff --git a/tools/sortpages b/tools/sortpages
old mode 100644
new mode 100755
index 29689fd..528ae98
--- a/tools/sortpages
+++ b/tools/sortpages
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # $Id: sortpages,v 1.8 1997/12/11 19:20:58 mhw Exp $
 #
diff --git a/tools/yapp b/tools/yapp
old mode 100644
new mode 100755
index ac78227..e8964ea
--- a/tools/yapp
+++ b/tools/yapp
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Yet another preprocessor
 #