diff --git a/.gitignore b/.gitignore
index 40cf1cf..5938f08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-/latexmk-443a.zip
-/latexmk-444.zip
 /latexmk-445.zip
 /latexmk-448.zip
+/latexmk-451.zip
diff --git a/latexmk-conf.patch b/latexmk-conf.patch
index 8ccc292..626f1f2 100644
--- a/latexmk-conf.patch
+++ b/latexmk-conf.patch
@@ -1,16 +1,16 @@
---- latexmk.1.orig	2016-10-13 10:25:04.000000000 -0600
-+++ latexmk.1	2016-10-24 20:42:40.410330454 -0600
-@@ -1064,6 +1064,7 @@ system RC file, in the following order,
+--- latexmk.1.orig	2017-01-14 09:29:39.173974237 -0700
++++ latexmk.1	2017-01-14 09:30:39.477593763 -0700
+@@ -1092,6 +1092,7 @@ system RC file, in the following order,
     "/opt/local/share/latexmk/LatexMk",
     "/usr/local/share/latexmk/LatexMk",
     "/usr/local/lib/latexmk/LatexMk".
 +   On a Fedora system, it only looks for "/etc/latexmk.conf".
-    On a MS-WINDOWS system it looks for "C:\\latexmk\\LatexMk".
+    On a MS-Windows system it looks for "C:\\latexmk\\LatexMk".
     On a cygwin system (i.e., a MS-Windows system in which Perl is
- that of cygwin), \fIlatexmk\fR reads for the first it finds of
---- latexmk.pl.orig	2016-09-05 21:35:52.000000000 -0600
-+++ latexmk.pl	2016-10-24 20:42:40.418329808 -0600
-@@ -969,13 +969,9 @@ else {
+ that of cygwin), \fIlatexmk\fR reads the first it finds of
+--- latexmk.pl.orig	2017-01-13 22:43:06.000000000 -0700
++++ latexmk.pl	2017-01-14 09:29:39.176974218 -0700
+@@ -842,13 +842,9 @@ else {
      ## /usr/local/share, depending on the local conventions.
      ## But /usr/local/lib/latexmk is put in the list for
      ## compatibility with older versions of latexmk.
diff --git a/latexmk.conf b/latexmk.conf
index 61d2a5f..8cbb119 100644
--- a/latexmk.conf
+++ b/latexmk.conf
@@ -66,8 +66,8 @@
 # $cleanup_includes_generated = 0
 
 # How much cleaning to do: 0 specifies normal operation (no cleaning),
-# 1 specifies a full cleanup, and 2 specifies a cleanup that leaves DVI,
-# PostScript, and PDF files.
+# 1 specifies a full cleanup, and 2 specifies a cleanup that leaves dvi, dviF,
+# pdf, ps, psF, and xdv files.
 # $cleanup_mode = 0;
 
 # Whether to just cleanup, or also generate files
@@ -173,6 +173,9 @@ $dvi_update_method = 1;
 # The command to search for tex-related files
 # $kpsewhich = 'kpsewhich %S';
 
+# Show calls to and results from kpsewhich
+# $kpsewhich_show = 0;
+
 # If nonzero, run in landscape mode; otherwise in portrait mode
 # $landscape_mode = 0;
 
@@ -199,6 +202,15 @@ $dvi_update_method = 1;
 # The program that prints PDF files
 # $lpr_pdf = 'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
 
+# The name of the LUALaTeX program
+# $lualatex = 'lualatex %O %S';
+
+# Default switches to pass to the lualatex program
+# $lualatex_default_switches = '';
+
+# The command line switch to make lualatex run in silent mode
+# $lualatex_silent_switch = '-interaction=batchmode';
+
 # Command to run make
 # $make = 'make';
 
@@ -228,6 +240,8 @@ $MSWin_fudge_break = 0;
 # 1 = Create a PDF file with pdflatex
 # 2 = Create a PDF file with ps2pdf
 # 3 = Create a PDF file with dvipdf
+# 4 = Create a PDF file with lualatex
+# 5 = Create a PDF file with xelatex + xdvipdfmx
 # $pdf_mode = 0;
 
 # The command to invoke a PDF previewer
@@ -351,3 +365,18 @@ $ps_update_method = 1;
 # means that the PDF is viewed if it is generated, else PostScript is viewed if
 # it is generated, else DVI is viewed.
 # $view = 'default';
+
+# The command to convert an XDV file into a PDF file.
+# $xdvipdfmx = 'xdvipdfmx -o %D %O %S';
+
+# Command line switch for xdvipdfmx to make it run in silent mode
+# $xdvipdfmx_silent_switch = '-q';
+
+# The name of the LaTeX program that produces XDV files by default
+# $xelatex = 'xelatex -no-pdf %O %S';
+
+# Default switches to pass to the xelatex program
+# $xelatex_default_switches = '';
+
+# The command line switch to make xelatex run in silent mode
+# $xelatex_silent_switch = '-interaction=batchmode';
diff --git a/latexmk.spec b/latexmk.spec
index 9820051..7ba0a2e 100644
--- a/latexmk.spec
+++ b/latexmk.spec
@@ -1,5 +1,5 @@
 Name:           latexmk
-Version:        4.48
+Version:        4.51
 Release:        1%{?dist}
 Summary:        A make-like utility for LaTeX files
 
@@ -75,6 +75,9 @@ rm -f extra-scripts/*.bat
 %license COPYING
 
 %changelog
+* Sat Jan 14 2017 Jerry James <loganjerry@gmail.com> - 4.51-1
+- Update to 4.51
+
 * Tue Oct 25 2016 Jerry James <loganjerry@gmail.com> - 4.48-1
 - Update to 4.48
 
diff --git a/sources b/sources
index b73d0e2..dea83f7 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-25ac4b7d7f678b86865ba646fa8d7043  latexmk-448.zip
+SHA512 (latexmk-451.zip) = 5f3f29ec4793d1214a59c8609eea5871bbf203e6df4ce929db034c09c5091845bcb679d91a6c73131eda68ab6bbe0e949f35156f32308fd3c581b62b57998fff