diff -ruN orig-calculix-ccx/files/patch-Makefile calculix-ccx/files/patch-Makefile
--- orig-calculix-ccx/files/patch-Makefile	2019-12-30 15:54:31.823931000 +0100
+++ calculix-ccx/files/patch-Makefile	2019-12-30 16:24:34.384489000 +0100
@@ -4,7 +4,7 @@
  
 -CFLAGS = -Wall -O2  -I ../../../SPOOLES.2.2 -DARCH="Linux" -DSPOOLES -DARPACK -DMATRIXSTORAGE -DNETWORKOUT
 -FFLAGS = -Wall -O2 
-+CFLAGS += -O2 -I%%LOCALBASE%%/include -I%%LOCALBASE%%/include/spooles -DARCH="FreeBSD" -DSPOOLES -DARPACK -DMATRIXSTORAGE -DNETWORKOUT -DTAUCS
++CFLAGS += -O2 -I%%LOCALBASE%%/include -I%%LOCALBASE%%/include/spooles -DARCH="FreeBSD" -DSPOOLES -DARPACK -DMATRIXSTORAGE -DNETWORKOUT -DTAUCS -DUSE_MT=1
 +FFLAGS += -O2 
  
 -CC=cc