diff -Nru orig/pbdBASE/src/Makevars.ucrt patched/pbdBASE/src/Makevars.ucrt
--- orig/pbdBASE/src/Makevars.ucrt	1969-12-31 16:00:00.000000000 -0800
+++ patched/pbdBASE/src/Makevars.ucrt	2021-03-19 05:16:42.121809100 -0700
@@ -0,0 +1,78 @@
+### Rscript
+R_SCMD = ${R_HOME}/bin${R_ARCH_BIN}/Rscript -e
+
+### Get ScaLAPACK information from "pbdSLAP".
+SLAP_LDFLAGS = $(shell ${R_SCMD} \
+  "library(pbdMPI);get.lib('R_SLAP','"${R_ARCH}"','pbdSLAP')")
+
+### Get MPI information from "pbdMPI". Note that Windows uses different FLAGS.
+MPI_ROOT = $(shell ${R_SCMD} \
+  "library(pbdMPI);get.conf('MPI_ROOT','"${R_ARCH}"','pbdMPI')")
+MPI_INCLUDE = $(shell ${R_SCMD} \
+  "library(pbdMPI);get.conf('MPI_INCLUDE','"${R_ARCH}"','pbdMPI')")
+MPI_LIB = $(shell ${R_SCMD} \
+  "library(pbdMPI);get.conf('MPI_LIB','"${R_ARCH}"','pbdMPI')")
+
+### For gfortran
+GFORTRAN_FLAGS = -DUSE_FC_LEN_T
+
+### Setup R package flags and substitute by configure for ${MPI_...}.
+#PKG_CPPFLAGS = -I"$(MPI_INCLUDE)"  -I../inst/RNACI $(GFORTRAN_FLAGS)
+PKG_CPPFLAGS = -I../inst/RNACI $(GFORTRAN_FLAGS)
+PKG_LIBS = "$(SLAP_LDFLAGS)" $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) "$(MPI_LIB)" $(RNACI_LDFLAGS)
+
+### Setup R source code and objects.
+R_SRCS_C = $(wildcard *.c) \
+           $(wildcard base/*.c) \
+           $(wildcard base/expm/*.c) \
+           $(wildcard base/utils/*.c) \
+           $(wildcard export_blacs/*.c) \
+           $(wildcard utils/*.c)
+R_SRCS_F = $(wildcard *.f) \
+           $(wildcard base/*.f) \
+           $(wildcard base/linalg/*.f) \
+           $(wildcard base/utils/*.f)
+R_SRCS_F90 = $(wildcard base/linalg/*.f90) \
+             $(wildcard base/stats/*.f90) \
+             $(wildcard base/utils/*.f90) \
+             $(wildcard utils/*.f90)
+
+R_OBJS = $(R_SRCS_C:.c=.o) $(R_SRCS_F:.f=.o) $(R_SRCS_F90:.f90=.o)
+OBJECTS = $(R_OBJS)
+
+### For user configuration.
+USER_CONF = Makeconf
+
+### Start making here.
+all: Makeconf $(SHLIB)
+
+Makeconf:
+	$(ECHO) 'RNACI_CPPFLAGS = $(RNACI_CPPFLAGS)' > $(USER_CONF)
+	$(ECHO) 'RNACI_LDFLAGS = $(RNACI_LDFLAGS)' >> $(USER_CONF)
+	$(ECHO) 'SLAP_LDFLAGS = $(SLAP_LDFLAGS)' >> $(USER_CONF)
+	$(ECHO) 'MPI_ROOT = $(MPI_ROOT)' >> $(USER_CONF)
+	$(ECHO) 'MPI_INCLUDE = $(MPI_INCLUDE)' >> $(USER_CONF)
+	$(ECHO) 'MPI_LIB = $(MPI_LIB)' >> $(USER_CONF)
+	$(ECHO) 'PKG_CPPFLAGS = $(PKG_CPPFLAGS)' >> $(USER_CONF)
+	$(ECHO) 'PKG_CFLAGS = $(PKG_CFLAGS)' >> $(USER_CONF)
+	$(ECHO) 'PKG_FFLAGS = $(PKG_FFLAGS)' >> $(USER_CONF)
+	$(ECHO) 'PKG_LIBS = $(PKG_LIBS)' >> $(USER_CONF)
+
+# Fortran module dependencies
+utils/quicksort_utils.o: utils/swaps.o
+utils/sorts.o: utils/quicksort_utils.o utils/swaps.o
+utils/subset.o: utils/subset_special.o utils/subset_utils.o
+utils/subset_special.o: utils/sorts.o
+
+$(SHLIB): $(OBJECTS)
+
+clean:
+	@rm -rf *.o *.d *.rc *.so *.dll *.dylib *.a *.lib \
+	        Makedeps Makevars $(USER_CONF) $(SHLIB) $(OBJECTS) \
+	        base/*.o \
+	        base/expm/*.o \
+	        base/linalg/*.o \
+	        base/stats/*.o \
+	        base/utils/*.o \
+	        export_blacs/*.o \
+	        utils/*.o