Compiling SuiteSparse on Win64

#How to compile suitesparse on Win64
#(How I did it, at least)

#download msys2 from
#http://www.msys2.org/
#Remember to download the x86_64 version
#Get stuff up to date as described on the website:
pacman -Syu
#probably need to close the program at this point, then restart and
pacman -Syu

#install make
pacman -S make

#install gcc toolchain, you can search available packages with
pacman -Ss gcc
#for me, the latest version was
pacman -S mingw64/mingw-w64-x86_64-gcc
#again, remember to get the 64bit version (NOT i686)

#see e.g. https://stackoverflow.com/questions/30069830/how-to-install-mingw-w64-and-msys2 for more info

#install fortran toolchain
#either by searching
pacman -Ss fortran
#or directly
pacman -S mingw64/mingw-w64-x86_64-gcc-fortran

#download openblas 64 bit binaries, or alternatively compile from source by simply opening mingw64,
#travelling to the source directory and typing make
#http://www.openblas.net/

#download compiled binaries for LAPACK if you wanna use CHOLMOD, from
#http://icl.cs.utk.edu/lapack-for-windows/lapack/index.html#libraries
#for typical electrical-machine-size problems UMFPACK+AMD alone works just as well.

#download compiled binaries for metis if you wanna use it with CHOLMOD
#http://www.opentelemac.org/index.php/component/jdownloads/summary/23-installation-files/158-metis-5-0-2-compiled-on-windows-with-mingw-s-gfortran-64bit?Itemid=54

######################################################
# configuring suitesparse makefile

#download suitesparse source
#make the following modifications to SuiteSparse_config/SuiteSparse_config.mk:

#add -DNTIMER flag to the compiler flags (CF) (otherwise compiler throws an error about clock_monotonic)
#you might need to add -mwindows to the flags too, I'm not sure.

#add -shared to LDLIBS
#add also -Wl,--out-implib,$(LIBRARY).a if you want .a files that gcc can link (if used with Matlab)

#specify BLAS and LAPACK paths in the end of the # required libraries section, e.g.
    BLAS= -Lc:/Antti/Software/OB/lib -lopenblas -lpthread -lgfortran
    LAPACK= -Lc:/Antti/Software/LAPACK/ -llapack
#you might need to use quotation marks if your path contains whitespaces, I dunno

#under Shell commands section, specify compilers:
    CC = gcc
    F77 = gfortran

#if you don't wanna use CHOLMOD with UMFPACK, under section UMFPACK Configuration set
UMFPACK_CONFIG = -DNCHOLMOD

#if you don't wanna use metis with CHOLMOD, under CHOLMOD Configuration append the flag
-DNPARTITION
#to CHOLMOD_CONFIG

##################################
# now the compiling:

#if you only need UMFPACK, the following suffices.
#Open MinGW and travel to the suitesparse main directory
cd SuiteSparse_config
make
cd ..
cd AMD
make library #demos don't works
cd ..
cd UMFPACK
make library

#if you need entire suitesparse (you'll need LAPACK for this, plus either download metis, or disable it with -DNPARTITION), simply type
make library
#in the main suitesparse directory