diff --git a/mingw-w64-calculix-ccx/PKGBUILD b/mingw-w64-calculix-ccx/PKGBUILD
new file mode 100644
index 0000000000000..35294d8005555
--- /dev/null
+++ b/mingw-w64-calculix-ccx/PKGBUILD
@@ -0,0 +1,61 @@
+# Maintainer: Rafał Brzegowy <rafal.brzegowy@yahoo.com>
+
+_realname=calculix-ccx
+pkgbase=mingw-w64-${_realname}
+pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
+pkgver=2.21
+pkgrel=1
+pkgdesc="CalculiX: 3D Structural Finite Element Program - Solver (mingw-w64)"
+arch=('any')
+mingw_arch=('mingw64' 'ucrt64')
+url="http://www.calculix.de/"
+license=('spdx:GPL-2.0-or-later')
+depends=("${MINGW_PACKAGE_PREFIX}-arpack"
+         "${MINGW_PACKAGE_PREFIX}-arpack64"
+         "${MINGW_PACKAGE_PREFIX}-omp"
+         "${MINGW_PACKAGE_PREFIX}-openblas"
+         "${MINGW_PACKAGE_PREFIX}-openblas64"
+         "${MINGW_PACKAGE_PREFIX}-spooles"
+         $([[ ${MINGW_PACKAGE_PREFIX} == *-clang-* ]] || echo "${MINGW_PACKAGE_PREFIX}-gcc-libgfortran"))
+makedepends=("${MINGW_PACKAGE_PREFIX}-fc")
+source=("http://www.dhondt.de/ccx_${pkgver}.src.tar.bz2"
+        "http://www.dhondt.de/gpl-2.0.txt"
+        "ccx_mingw.patch"
+        "ccx_ooc.patch")
+sha256sums=('52a20ef7216c6e2de75eae460539915640e3140ec4a2f631a9301e01eda605ad'
+            '8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643'
+            '64a9b4aae8910f1acd1d28b65e188134775670f9ada5d15614df38c9cda16c53'
+            'dd81df3de137a05b45e39fe61830337e6405ec566148598dab2828a6d9780e8a')
+
+prepare() {
+  cd "${srcdir}/CalculiX/ccx_${pkgver}/src"
+  patch -Np1 < ../../../ccx_mingw.patch
+  patch -Np1 < ../../../ccx_ooc.patch
+}
+
+build()
+{
+  cd "${srcdir}/CalculiX/ccx_${pkgver}/src"
+  if [[ ${MINGW_PACKAGE_PREFIX} != *-clang-* ]]; then
+    CFLAGS+=" -fopenmp"
+    FC=gfortran
+    export FFLAGS="-fallow-argument-mismatch -fopenmp -O2"
+    export OMP_LIBS="-lgomp -lquadmath"
+  else
+    CFLAGS+=" -fopenmp -Wno-implicit-function-declaration"
+    FC=flang
+    export FFLAGS="-O2"
+    export OMP_LIBS="-lomp"
+  fi
+
+  make CC=${CC} FC=${FC} CCX_VERSION=${pkgver} -f Makefile_mingw_i4
+  make CC=${CC} FC=${FC} CCX_VERSION=${pkgver} -f Makefile_mingw_i8
+}
+
+package()
+{
+  install -Dm755 ${srcdir}/CalculiX/ccx_${pkgver}/src/ccx_i4/ccx_i4.exe ${pkgdir}${MINGW_PREFIX}/bin/ccx.exe
+  install -Dm755 ${srcdir}/CalculiX/ccx_${pkgver}/src/ccx_i8/ccx_i8.exe ${pkgdir}${MINGW_PREFIX}/bin/ccx_i8.exe
+
+  install -Dm755 ${srcdir}/gpl-2.0.txt ${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}/LICENSE
+}
diff --git a/mingw-w64-calculix-ccx/ccx_mingw.patch b/mingw-w64-calculix-ccx/ccx_mingw.patch
new file mode 100644
index 0000000000000..06af03149b7cc
--- /dev/null
+++ b/mingw-w64-calculix-ccx/ccx_mingw.patch
@@ -0,0 +1,163 @@
+--- a/Makefile_mingw_i8
++++ b/Makefile_mingw_i8
+@@ -0,0 +1,44 @@
++#Specify where to store the generated .o files
++OBJDIR = ccx_i8
++
++CFLAGS += -DARCH="Linux" -DARPACK -DMATRIXSTORAGE -DUSE_MT=1 -DNETWORKOUT -DCALCULIX_EXTERNAL_BEHAVIOURS_SUPPORT -fcommon
++
++CFLAGS += -DINTSIZE64
++FFLAGS += -fdefault-integer-8
++
++#SPOOLES
++CFLAGS+= -I ${MINGW_PREFIX}/include/spooles -DSPOOLES
++
++CC=CC
++FC=FC
++
++#Source files in this folder and in the adapter directory
++$(OBJDIR)/%.o : %.c
++	$(CC) $(CFLAGS) -c $< -o $@
++$(OBJDIR)/%.o : %.f
++	$(FC) $(FFLAGS) -c $< -o $@
++
++include Makefile.inc
++
++SCCXMAIN = ccx_$(CCX_VERSION).c
++
++OCCXF = $(SCCXF:%.f=$(OBJDIR)/%.o)
++OCCXC = $(SCCXC:%.c=$(OBJDIR)/%.o)
++OCCXMAIN = $(SCCXMAIN:%.c=$(OBJDIR)/%.o)
++
++LDFLAGS = -lspoolesMT -lspooles
++
++$(OBJDIR)/$(OBJDIR).exe: $(OBJDIR) $(OCCXMAIN) $(OBJDIR)/ccx_$(CCX_VERSION).a
++	 ./date.pl; $(CC) $(CFLAGS) -c $(SCCXMAIN);
++	 $(FC) $(FFLAGS) \
++	 -o $@ $(OCCXMAIN) $(OBJDIR)/ccx_$(CCX_VERSION).a \
++	 -lpthread $(OMP_LIBS) -larpack_64 -lopenblas_64 $(LDFLAGS) -lstdc++
++
++$(OBJDIR)/ccx_$(CCX_VERSION).a: $(OCCXF) $(OCCXC)
++	ar vr $@ $?
++
++$(OBJDIR):
++	mkdir -p $(OBJDIR)
++
++clean:
++	rm -f $(OBJDIR)/*.o $(OBJDIR)/ccx_$(CCX_VERSION).a $(OBJDIR)/ccx_$(OBJDIR).exe
+--- a/Makefile_mingw_i4
++++ b/Makefile_mingw_i4
+@@ -0,0 +1,41 @@
++#Specify where to store the generated .o files
++OBJDIR = ccx_i4
++
++CFLAGS += -DARCH="Linux" -DARPACK -DMATRIXSTORAGE -DUSE_MT=1 -DNETWORKOUT -DCALCULIX_EXTERNAL_BEHAVIOURS_SUPPORT -fcommon
++
++#SPOOLES
++CFLAGS+= -I ${MINGW_PREFIX}/include/spooles -DSPOOLES
++
++CC=CC
++FC=FC
++
++#Source files in this folder and in the adapter directory
++$(OBJDIR)/%.o : %.c
++	$(CC) $(CFLAGS) -c $< -o $@
++$(OBJDIR)/%.o : %.f
++	$(FC) $(FFLAGS) -c $< -o $@
++
++include Makefile.inc
++
++SCCXMAIN = ccx_$(CCX_VERSION).c
++
++OCCXF = $(SCCXF:%.f=$(OBJDIR)/%.o)
++OCCXC = $(SCCXC:%.c=$(OBJDIR)/%.o)
++OCCXMAIN = $(SCCXMAIN:%.c=$(OBJDIR)/%.o)
++
++LDFLAGS = -lspoolesMT -lspooles
++
++$(OBJDIR)/$(OBJDIR).exe: $(OBJDIR) $(OCCXMAIN) $(OBJDIR)/ccx_$(CCX_VERSION).a
++	 ./date.pl; $(CC) $(CFLAGS) -c $(SCCXMAIN);
++	 $(FC) $(FFLAGS) \
++	 -o $@ $(OCCXMAIN) $(OBJDIR)/ccx_$(CCX_VERSION).a \
++	 -lpthread $(OMP_LIBS) -larpack -lopenblas $(LDFLAGS) -lstdc++
++
++$(OBJDIR)/ccx_$(CCX_VERSION).a: $(OCCXF) $(OCCXC)
++	ar vr $@ $?
++
++$(OBJDIR):
++	mkdir -p $(OBJDIR)
++
++clean:
++	rm -f $(OBJDIR)/*.o $(OBJDIR)/ccx_$(CCX_VERSION).a $(OBJDIR)/ccx_$(OBJDIR).exe
+diff -urN src_orig/ccx_2.21.c src/ccx_2.21.c
+--- src_orig/ccx_2.21.c	2023-07-29 10:52:01.000000000 +0200
++++ src/ccx_2.21.c	2023-07-29 16:47:06.838731000 +0200
+@@ -15,10 +15,6 @@
+ /*     along with this program; if not, write to the Free Software       */
+ /*     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.         */
+ 
+-#ifdef __WIN32
+-_set_output_format(_TWO_DIGIT_EXPONENT);
+-#endif
+-
+ #ifdef CALCULIX_MPI
+ #include <spoolesMPI.h>
+ #endif
+@@ -37,6 +33,10 @@
+ 
+ int main(int argc,char *argv[])
+ {
++	
++#if defined(_WIN32) && !defined(_UCRT)
++_set_output_format(_TWO_DIGIT_EXPONENT);
++#endif
+   
+   FILE *f1;
+     
+diff -urN src_orig/ccx_2.21step.c src/ccx_2.21step.c
+--- src_orig/ccx_2.21step.c	2023-07-29 10:52:01.000000000 +0200
++++ src/ccx_2.21step.c	2023-07-29 17:05:22.548207900 +0200
+@@ -15,10 +15,6 @@
+ /*     along with this program; if not, write to the Free Software       */
+ /*     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.         */
+ 
+-#ifdef __WIN32
+-_set_output_format(_TWO_DIGIT_EXPONENT);
+-#endif
+-
+ #ifdef CALCULIX_MPI
+ #include <spoolesMPI.h>
+ #endif
+@@ -44,6 +40,10 @@
+                   ITG *inputsteps,ITG *iperturb,ITG *irstrt,char **filabp,
+                   ITG *nlabel)
+ {
++	
++#if defined(_WIN32) && !defined(_UCRT)
++_set_output_format(_TWO_DIGIT_EXPONENT);
++#endif
+ 
+   /* in FORTRAN convention:
+ 
+--- a/restartwrite.f
++++ b/restartwrite.f
+@@ -113,7 +113,7 @@
+ !     
+ !     check whether the restart file exists and is opened
+ !     
+-         call system("rm -f temporaryrestartfile")
++         call execute_command_line("rm -f temporaryrestartfile")
+ !     
+          open(15,file="temporaryrestartfile",ACCESS='SEQUENTIAL',
+      &        FORM='UNFORMATTED',err=151)
+--- a/writeobj.f
++++ b/writeobj.f
+@@ -55,7 +55,7 @@
+       dd=0.d0
+       do j=1,ndesi
+          inode=nodedesi(j)
+-         dd=dd+dgdxglob(1,inode,i)**2
++         dd=dd+dgdxglob(1,INT(inode),i)**2
+       enddo
+       dd=dsqrt(dd)
+       write(5,'(3x,a16,e14.7,3x,e16.7,3x,a80)') objectset(1,i),g0(i),
diff --git a/mingw-w64-calculix-ccx/ccx_ooc.patch b/mingw-w64-calculix-ccx/ccx_ooc.patch
new file mode 100644
index 0000000000000..c4d590d92586a
--- /dev/null
+++ b/mingw-w64-calculix-ccx/ccx_ooc.patch
@@ -0,0 +1,101 @@
+diff -urN src_orig/pardiso.c src/pardiso.c
+--- src_orig/pardiso.c	2023-07-29 10:49:53.000000000 +0200
++++ src/pardiso.c	2023-07-29 17:06:32.810872800 +0200
+@@ -34,6 +34,50 @@
+ ITG mthread_mkl=0;
+ char envMKL[32];
+ 
++
++/* Added by Victor Kemp 2022-11-18 to enable Out-Of-Core (OOC) mode. */
++void initialize_iparm(ITG *symmetryflag){
++
++  ITG i;
++  char *env;
++
++  // Most values are 0
++  for(i=0;i<=63;i++){
++    iparm[i]=0;
++  }
++
++  // iparm(1) = 1 means all other values are specified instead of being defaults.
++  iparm[0]=1;
++
++  // Non-zero default values
++  iparm[1]=2;
++  if(*symmetryflag==0){
++    iparm[9]=8;
++    iparm[10]=0;
++    iparm[12]=0;
++  }else{
++    iparm[9]=13;
++    iparm[10]=1;
++    iparm[12]=1;
++  }    
++  iparm[17]=-1;
++  iparm[20]=1;
++
++  // iparm(60)
++  env=getenv("MKL_PARDISO_OOC_MAX_CORE_SIZE");
++  if(env) {
++    // PARDISO chooses IC/OOC (In-Core / Out-Of-Core) mode according to the
++    // environment variables
++    // MKL_PARDISO_OOC_MAX_CORE_SIZE and
++    // MKL_PARDISO_OOC_MAX_SWAP_SIZE.
++    iparm[59]=1;
++  }else{
++    // Default. IC mode only.
++    iparm[59]=0;
++  }
++
++}
++
+ void pardiso_factor(double *ad, double *au, double *adb, double *aub, 
+ 		    double *sigma,ITG *icol, ITG *irow, 
+ 		    ITG *neq, ITG *nzs, ITG *symmetryflag, ITG *inputformat,
+@@ -55,6 +99,10 @@
+ 
+   iparm[0]=0;
+   iparm[1]=3;
++  
++  /* Added by Victor Kemp 2022-11-18 to enable Out-Of-Core (OOC) mode. */
++  initialize_iparm(symmetryflag);
++  
+   /* set MKL_NUM_THREADS to min(CCX_NPROC_EQUATION_SOLVER,OMP_NUM_THREADS)
+      must be done once  */
+   if (mthread_mkl == 0) {
+diff -urN src_orig/uamplitude.f src/uamplitude.f
+--- src_orig/uamplitude.f	2023-07-29 10:49:53.000000000 +0200
++++ src/uamplitude.f	2023-07-29 16:55:06.310789300 +0200
+@@ -33,11 +33,31 @@
+       implicit none
+ !
+       character*80 name
++      integer(4) time2
+ !
+-      real*8 time,amplitude
++      real*8 time,amplitude,pi
+ !
+       if(name(1:9).eq.'QUADRATIC') then
+          amplitude=time**2
++      else if(name(1:3).eq.'SIN') then
++         pi=4.d0*datan(1.d0)
++         amplitude=sin(time*pi/2)
++      else if(name(1:4).eq.'QSIN') then
++         pi=4.d0*datan(1.d0)
++         amplitude=sin(time*pi/2)**2
++      else if(name(1:6).eq.'ABSSIN') then
++         pi=4.d0*datan(1.d0)
++         amplitude=abs(sin(time*pi/2))
++      else if(name(1:3).eq.'COS') then
++         pi=4.d0*datan(1.d0)
++         amplitude=cos(time*pi/2)
++      else if(name(1:7).eq.'ONEZERO') then
++         time2=time
++	     if(modulo(time2,2).eq.0) THEN
++	        amplitude=(time-time2)	
++            else		
++                amplitude=1-(time-time2)
++	     endif
+       else
+          write(*,*) '*ERROR in uamplitude: unknown amplitude'
+          call exit(201)