diff -r 2a20cee18add PCbuild/build_ssl.py
--- a/PCbuild/build_ssl.py	Mon Jun 18 08:33:13 2012 -0600
+++ b/PCbuild/build_ssl.py	Mon Jun 18 12:45:54 2012 -0600
@@ -236,8 +236,11 @@
         copy(r"crypto\buildinf_%s.h" % arch, r"crypto\buildinf.h")
         copy(r"crypto\opensslconf_%s.h" % arch, r"crypto\opensslconf.h")
 
-        #makeCommand = "nmake /nologo PERL=\"%s\" -f \"%s\"" %(perl, makefile)
         makeCommand = "nmake /nologo -f \"%s\"" % makefile
+        # Ensure that there is a runnable Perl executable.  Perl could be
+        # located in the default location (\Perl\bin), but not on the PATH.
+        if perl is not None:
+            makeCommand += " PERL=\"%s\"" % perl
         print("Executing ssl makefiles:", makeCommand)
         sys.stdout.flush()
         rc = os.system(makeCommand)