Disable any parallel build options.
--- a/Makefile_dist
+++ b/Makefile_dist
@@ -20,7 +20,7 @@
 ######
 
 MAKE=make
-MAKEJ4=make -j4
+MAKEJ4=make
 
 ######
 #
@@ -52,7 +52,7 @@
 #
 ######
 
-src_patsopt: ; $(MAKE) -j4 -C src patsopt
+src_patsopt: ; $(MAKE) -C src patsopt
 bin_patsopt: src_patsopt ; $(CPF) src/patsopt bin/patsopt
 
 ######
