diff --git a/apps/CA.pl.in b/apps/CA.pl.in
index fbba457646bb73d030d54d577f79c9296c0ecb6e..f5e8e4a191ee26201ff179382e22cf99de637966 100644
--- a/apps/CA.pl.in
+++ b/apps/CA.pl.in
@@ -120,9 +120,9 @@ if ($WHAT eq '-newcert' ) {
     close OUT;
     # ask user for existing CA certificate
     print "CA certificate filename (or enter to create)\n";
-    $FILE = <STDIN>;
-    $FILE = s|\R$|| if $FILE;
-    if ($FILE) {
+    $FILE = "" unless defined($FILE = <STDIN>);
+    $FILE =~ s{\R$}{};
+    if ($FILE ne "") {
         copy_pemfile($FILE,"${CATOP}/private/$CAKEY", "PRIVATE");
         copy_pemfile($FILE,"${CATOP}/$CACERT", "CERTIFICATE");
     } else {
diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl
index a0b3bc06709dcbfaf6b56d8528749875f1e43584..0a023fb82f5b24ab61b1ff05d76688feb28e4bab 100755
--- a/crypto/perlasm/x86_64-xlate.pl
+++ b/crypto/perlasm/x86_64-xlate.pl
@@ -850,7 +850,7 @@ ___
 OPTION	DOTNAME
 ___
 }
-while($line=<>) {
+while(defined($line=<>)) {
 
     $line =~ s|\R$||;           # Better chomp
 
diff --git a/util/files.pl b/util/files.pl
index d984196616053efd2d73e23f4b07ac049ea41f66..32e712586d72bfac676f454f53ff92afa8b40ec4 100755
--- a/util/files.pl
+++ b/util/files.pl
@@ -25,8 +25,8 @@ while (<>)
 				{
 				$b=$`; # Keep what is before the backslash
 				$o.=$b." ";
-				$b=<>;
-				$b =~ s|\R$||; # Better chomp
+				$b = "" unless defined($b = <>);
+				$b =~ s{\R$}{};
 				}
 			else
 				{
@@ -43,7 +43,7 @@ while (<>)
 		}
 	}
 
-$pwd=`pwd`; $pwd =~ s|\R$||;
+($pwd=`pwd`) =~ s{\R$}{};
 
 if ($sym{'TOP'} eq ".")
 	{
diff --git a/util/mk1mf.pl b/util/mk1mf.pl
index 3a9f0d76b8267f3f82ea0e570ef18943deef8890..f29e50bb776f6b80bbb54f8a33f3a063c255a9d2 100755
--- a/util/mk1mf.pl
+++ b/util/mk1mf.pl
@@ -553,8 +553,10 @@ if ($fips)
 			{
 			open (IN, "util/fipslib_path.txt") || fipslib_error();
 			$fipslibdir = <IN>;
-			$fipslibdir =~ s|\R$||;
 			close IN;
+			$fipslibdir = "" unless defined($fipslibdir);
+			$fipslibdir =~ s{\R$}{};
+			fipslib_error() if ($fipslibdir eq "");
 			}
 		fips_check_files($fipslibdir,
 				"fipscanister.lib", "fipscanister.lib.sha1",
diff --git a/util/mkfiles.pl b/util/mkfiles.pl
index 4fbe29ac755aa84e210209507020ec1ed252721e..55dfbc64e376acd12a77adeaf3c3df7d5d4b4f4e 100755
--- a/util/mkfiles.pl
+++ b/util/mkfiles.pl
@@ -107,8 +107,8 @@ while (<IN>)
 				{
 				$b=$`;
 				$o.=$b." ";
-				$b=<IN>;
-				$b =~ s|\R$||;
+				$b = "" unless defined($b = <IN>);
+				$b =~ s{\R$}{};
 				}
 			else
 				{