# Errors building Julia on Windows with MKL

**URL:** <https://discourse.julialang.org/t/errors-building-julia-on-windows-with-mkl/22770>\
**Category:** General Usage\
**Created:** [April 4, 2019, 9:22pm UTC](https://discourse.julialang.org/t/errors-building-julia-on-windows-with-mkl/22770 "2019-04-04T21:22:51Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![JianghuiDu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jianghuidu/32/8028_2.png) [@JianghuiDu](https://discourse.julialang.org/u/JianghuiDu)\
**Post date:** [April 4, 2019, 9:22pm UTC](https://discourse.julialang.org/t/errors-building-julia-on-windows-with-mkl/22770/1 "2019-04-04T21:22:51Z")

</div>

Trying to build Julia 1.1 on Windows 10 with MKL.

```julia
git clone https://github.com/JuliaLang/julia.git
cd julia
tee Make.user << EOF
XC_HOST = x86_64-w64-mingw32
USE_INTEL_MKL = 1
MKLROOT = /cygdrive/c/Program\ Files\ \(x86\)/IntelSWTools/compilers_and_libraries_2017/windows/mkl
EOF

MKLROOT=/cygdrive/c/Program\ Files\ \(x86\)/IntelSWTools/compilers_and_libraries_2017/windows/mkl
mkdir -p usr/bin
cp "$MKLROOT/../redist/intel64_win/compiler/libiomp5md.dll" usr/bin/
cp "$MKLROOT/../redist/intel64_win/mkl/mkl*.dll" usr/bin/
cp usr/bin/mkl_rt.dll usr/bin/libmkl_rt.dll

make -j 8

```

Then it reported errors:

```julia
Base ───────────error during bootstrap:
rec_backtrace at /home/JD/julia/src/home/JD/julia/src\stackwalk.c:94
record_backtrace at /home/JD/julia/src/home/JD/julia/src\task.c:210 [inlined]
jl_throw at /home/JD/julia/src/home/JD/julia/src\task.c:417
jl_parse_eval_all at /home/JD/julia/src/home/JD/julia/src\ast.c:895
jl_load at /home/JD/julia/src/home/JD/julia/src\toplevel.c:861
exec_program at /home/JD/julia/ui/home/JD/julia/ui\repl.c:35
true_main at /home/JD/julia/ui/home/JD/julia/ui\repl.c:108
wmain at /home/JD/julia/ui/home/JD/julia/ui\repl.c:217
__tmainCRTStartup at /usr/src/debug/mingw64-x86_64-runtime-6.0.0-1/usr/src/debug/mingw64-x86_64-runtime-6.0.0-1/crt\crtexe.c:334
mainCRTStartup at /usr/src/debug/mingw64-x86_64-runtime-6.0.0-1/usr/src/debug/mingw64-x86_64-runtime-6.0.0-1/crt\crtexe.c:223
BaseThreadInitThunk at C:\WINDOWS\System32\KERNEL32.DLL (unknown line)
RtlUserThreadStart at C:\WINDOWS\SYSTEM32\ntdll.dll (unknown line)
 LoadError29(."086818s secondsy
sBase64 ─────────i m g3..j845161l seconds"
, CRC32c ─────────16 , LoadError0(."0C17799: seconds\\
cSHA ────────────y g w0i.n231201 seconds
6FileWatching ───4 \\ h0o.m132986e seconds\\
JUnicode ────────D \\ j0u.l0i19046a seconds\\
uMmap ───────────s r \\0s.h0a85164r secondse
\\Serialization ──j u l1i.a209416\\ secondss
tLibdl ──────────d l i0b.\\0v579841 seconds.
2Markdown ───────\\ S u1i.t125996e secondsS
pLibGit2 ────────a r s2e.\\680624s secondsr
cLogging ────────\\ S u0i.t516984e secondsS
pSockets ────────a r s1e..360468j secondsl
"Printf ─────────, 24 , 0LoadError.(0"16459C seconds:
\\Profile ────────c y g0w.i194451n seconds6
4Dates ──────────\\ h o1m.e820229\\ secondsJ
DDelimitedFiles ─\\ j u0l.i130741a seconds\\
uRandom ─────────s r \\0s.h711486a secondsr
eUUIDs ──────────\\ j u0l.i0a19332\\ secondss
tFuture ─────────d l i0b.\\0v239161 seconds.
2LinearAlgebra ──\\ S11u.i040242t secondse
SSparseArrays ───p a r4s.e03623\\0s secondsr
c\\umfpack.jl", 80, ErrorException("error compiling top-level scope: could not load library \"libumfpack\"\nThe specified module could not be found.\r\n"))))

***This error might be fixed by running `make clean`. If the error persists, try `make cleanall`.***
make[1]: *** [sysimage.mk:66: /home/JD/julia/usr/lib/julia/sys.ji] Error 1
make: *** [Makefile:81: julia-sysimg-ji] Error 2

```

But `libumfpack` is inside `usr/bin`.  
Anyone know what this means?