diff --git a/UnixBench/Makefile b/UnixBench/Makefile
index c9d1eba..62f36e1 100644
--- a/UnixBench/Makefile
+++ b/UnixBench/Makefile
@@ -1,5 +1,5 @@
 ##############################################################################
-#	UnixBench v5.1.1
+#	UnixBench v5.1.3
 #  Based on The BYTE UNIX Benchmarks - Release 3
 #          Module: Makefile   SID: 3.9 5/15/91 19:30:15
 #
@@ -30,6 +30,7 @@
 #                    09/26/07 changes for UnixBench 5.0
 #                    09/30/07 adding ubgears, GRAPHIC_TESTS switch
 #                    10/14/07 adding large.txt
+#                    01/13/11 added support for parallel compilation
 ##############################################################################
 
 ##############################################################################
@@ -43,7 +44,7 @@ SHELL = /bin/sh
 # X11 libraries on your system.
 #
 # Comment the line out to disable these tests.
-GRAPHIC_TESTS = defined
+# GRAPHIC_TESTS = defined
 
 # Set "GL_LIBS" to the libraries needed to link a GL program.
 GL_LIBS = -lGL -lXext -lX11
@@ -228,10 +229,10 @@ $(PROGDIR)/dhry2: $(SRCDIR)/dhry_1.c $(SRCDIR)/dhry_2.c $(SRCDIR)/dhry.h
 	$(CC) -o $(PROGDIR)/dhry2 ${CFLAGS} ${OPTON} $(SRCDIR)/dhry_1.o $(SRCDIR)/dhry_2.o
 	cd $(SRCDIR); rm -f dhry_1.o dhry_2.o
 $(PROGDIR)/dhry2reg: $(SRCDIR)/dhry_1.c $(SRCDIR)/dhry_2.c $(SRCDIR)/dhry.h
-	cd $(SRCDIR); $(CC) -c ${CFLAGS} -DREG=register -DHZ=${HZ} ${OPTON} dhry_1.c
-	cd $(SRCDIR); $(CC) -c ${CFLAGS} -DREG=register -DHZ=${HZ} ${OPTON} dhry_2.c
-	$(CC) -o $(PROGDIR)/dhry2reg ${CFLAGS} ${OPTON} $(SRCDIR)/dhry_1.o $(SRCDIR)/dhry_2.o
-	cd $(SRCDIR); rm -f dhry_1.o dhry_2.o
+	cd $(SRCDIR); $(CC) -c ${CFLAGS} -DREG=register -DHZ=${HZ} ${OPTON} dhry_1.c -o dhry_1_reg.o
+	cd $(SRCDIR); $(CC) -c ${CFLAGS} -DREG=register -DHZ=${HZ} ${OPTON} dhry_2.c -o dhry_2_reg.o
+	$(CC) -o $(PROGDIR)/dhry2reg ${CFLAGS} ${OPTON} $(SRCDIR)/dhry_1_reg.o $(SRCDIR)/dhry_2_reg.o
+	cd $(SRCDIR); rm -f dhry_1_reg.o dhry_2_reg.o
 
 $(PROGDIR)/looper: $(SRCDIR)/looper.c
 	$(CC) -o $(PROGDIR)/looper ${CFLAGS} ${OPTON} $(SRCDIR)/looper.c
diff --git a/UnixBench/README b/UnixBench/README
index 9a4f0c8..67cad92 100644
--- a/UnixBench/README
+++ b/UnixBench/README
@@ -1,4 +1,4 @@
-Version 5.1.2 -- 2007-12-26
+Version 5.1.3 -- 2011-01-13
 
 ================================================================
 To use Unixbench:
@@ -27,6 +27,18 @@ For information on adding tests into the benchmark, see "WRITING_TESTS".
 
 ===================== RELEASE NOTES =====================================
 
+========================  Jan 13 ==========================
+
+v5.1.3
+
+Fixed issue that would cause a race condition if you attempted to compile in
+parallel with more than 3 parallel jobs.
+
+
+Kelly Lucas, Jan 13, 2011
+kdlucas at gmail period com
+
+
 ========================  Dec 07 ==========================
 
 v5.1.2
diff --git a/UnixBench/Run b/UnixBench/Run
index aa961e8..d615935 100755
--- a/UnixBench/Run
+++ b/UnixBench/Run
@@ -8,7 +8,7 @@ use IO::Handle;
 
 
 ############################################################################
-#  UnixBench - Release 5.1.1, based on:
+#  UnixBench - Release 5.1.3, based on:
 #  The BYTE UNIX Benchmarks - Release 3
 #          Module: Run   SID: 3.11 5/15/91 19:30:14
 # Original Byte benchmarks written by:
@@ -55,6 +55,7 @@ use IO::Handle;
 # 2007.10.12    IS      Added graphics tests, categories feature.
 # 2007.10.14    IS      Set and report LANG.  Added "grep" and "sysexec".
 # 2007.12.22    IS      Tiny fixes; see README.
+# 2011.01.13    KDL     Fix for parallel compilation.
 
 
 ############################################################################
@@ -62,7 +63,7 @@ use IO::Handle;
 ############################################################################
 
 # Version number of the script.
-my $version = "5.1.2";
+my $version = "5.1.3";
 
 # The setting of LANG makes a huge difference to some of the scores,
 # particularly depending on whether UTF-8 is used.  So we always set